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Questions tagged [geology]

The science comprising the study of the rocks Earth is composed of, and the processes by which they change. Some subfields of geology are petrology, mineralogy, and geophysics.

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Is there a “submerged object” in Australia that causes a magnetic deviation of 20 degrees?

This answer quotes this blogpost as an example of a magnetic anomaly: Basalt formation, “Mt. Jim”, in remote north-east Victoria, Australia, has a magnetic anomaly -20 degree magnetic compass ...
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135 views

python generate 3d unstructured grid

I would like to create a 3d unstructured grid based on data points with xyz and property. Can Python do this and what tools? My question is quite generic but i can provide more details: the data has ...
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1answer
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Rocks sparking under water

I have searched for an answer to this question for years, to verify if it was true. A man that lived on a river in the rugged part of the northern Washington Cascades told me an interesting story. He ...
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1answer
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Historically, how did the total amount of salt / NaCl on Earth develop?

After reading this question about the origin of NaCl on Earth, I'm wondering: How did the amount of NaCl develop historically? Is it a more or less linear growth until today? Was it such a linear ...
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How do I generate a Moho depth model from seismic refraction data?

There are several permanent seismograph stations in Eastern Canada that have been recording arrival times for over 25 years. Using refracted Pn arrival times from natural earthquakes I would like to ...
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2answers
342 views

How do the different densities of the oceanic and continental crust affect earth's outer shape?

I am currently reading a textbook and I am slightly confused at a paragraph that deals with some general facts about earth's outer shape. It mentions that the density of the continental crust is ...
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1answer
157 views

Is astrochronology a proper method?

Wikipedia's definition of astrochronology is: "Astrochronology is the dating of sedimentary units by calibration with astronomically tuned timescales, such as Milankovic cycles,1[2] or even ...
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2answers
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What caused this waterfall to have rounded formations?

This is at Bua Tong Waterfalls in Chiang Mai, Thailand. Tried to find scientific information about this waterfall, but google turns up only travellers' vague guesses, suggesting calcium carbonate ...
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What are the name of these stones?

There are some kind of stone, I collected them and I want to be sure of their identification.
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1answer
317 views

Please identify this pink transparent stone?

Pink transparent stone it maybe obsidian but my research indicates pink colour is very unusual for obsidian It’s translucent, all pink, slightly refractive you can read letters through when stone is ...
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2answers
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Please help identify this! Rock? Glass? Crystal? It's big and very heavy [closed]

About 1.5 feet tall, 1 foot deep and 2 foot wide. Very heavy and very hard. I will get a better picture posted asap. You can read a newspaper thru it. Was left to me by my uncle years ago but never ...
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1answer
66 views

I need help to identify this rock

I would like help to identify this Stone. I found this stone in my back yard. I would just like to know if it is worth anything or if I'm just going to add it to the driveway.
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2answers
57 views

Subrelluric forces in a volcanic eruption

I am listening to a song about volcanoes. It is called "Pyroclastic Annihilation" performed by a brutal deth/thrash metal band called "Demolition Hammer". It is from their album "Epidemic of Violence" ...
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2answers
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What is this? A sinkhole?

Lat., long.38.47491, 43.48882, in the vicinity of Van in Turkey I saw this when hiking. I want to know what it is and what are the dangers it poses. Lots of people hike that area in spring and summer,...
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1answer
124 views

Seeming correlation between time of day and earthquakes

I live in a generally geographically active area (Southern California, near the San Andreas fault, if that matters), that has had two relatively minor earthquakes that I have felt in the last week (in ...
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1answer
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Can anyone help me identify this rock?

This is probably just something really common and boring to most people, but I was intrigued so I thought I might as well ask now I can. When I was in Portugal (I don’t know specifically where we were)...
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Rock ID: Dark, Hard, Midland Valley Scotland

Found this in a river. The dark part is the rock still drying out. I think the smoothness is the weathering from the river. The rock is heavy and a little bit rough on the underside among the ...
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1answer
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The magnetite is in which type of magma

In which type of magma can I find magnetite? Peraluminous or peralkaline? I've been looking and the peraluminous magma have a lot of oxides so I thought it would be reduced magma so it would have ...
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1answer
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How does palingenetic fusion occur in rock?

As far as charnockites are concerned, granitic charnockites are formed due to palingenetic fusion and metasomatism, while granulitic charnockites are formed due to high grade metamorphism. When I ...
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Can anyone help me identify these rocks please?

I apologize for any errors in my pictures or writing. My first post. [
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0answers
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Whats this stone?

Found it couple days ago and it amazes me how smooth the surface is but cant identify it please help me. Found it in north germany near a lake on a trip there.
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Can you help me identify my rock?

I found this rock in my yard. Can someone please identify it for me? I’m not sure if you can see the blue hue on the rock in the picture! (https://i.stack.imgur.com/cuklH.jpg)
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2answers
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Is this very old glass or a type of crystal?

I found these in Spain buried within a very old rocky sea bed along with many fossils, would this just be peices of damaged old glass or is it some form of crystal/rock? Thank you in advance
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1answer
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Please help me identify the inside of this stone

please could you help me identify this stone I found on the beach, it almost looks like it has tiny eggs inside but they definitely aren’t as they are solid and aren’t removable Thank you in advance
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1answer
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What is meant by Massif?

In India, Panchchuli, Kun Nun and Shilong only these mountain are claimed to be massif. Why other mountain formations are not termed as massif...? What are the characteristics of massif..? Anybody ...
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1answer
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What kind of rock is this? It was inside a bigger rock

I found this when I was really little, and I'm 18 now. It was inside a bigger rock; the three pieces fit together to make one piece. The biggest piece seems to have some kind of fossil on it. I've ...
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1answer
67 views

If the earth were completely smooth and covered in water, what would occur with ocean waves?

Related to this post: If the Earth were a smooth spheroid, how deep would the ocean be?
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1answer
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Mineral identification; black & metallic

During a recent trip to the Portuguese island of Madeira, I found a couple of interesting rocks on a beach. Both the rocks pictured in this question contain the same black mineral. I first guessed ...
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2answers
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Help me figure out what this purple rock is

I found this in the ground at a job site in blue springs mo . Its purple with darker purple lines through it like growth marks on a tree. It is about the size of a large loaf of bread 7 inches across ...
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1answer
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Can someone help me identify this crystal

So the actual rock looks black but I put it up to the light n I see green n black.... can you help me figure out what it is ? my grandfather gave it to me years ago n I’d like to find out more about ...
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1answer
391 views

Why do some earthquakes and volcanoes occur within plates?

I know that volcanoes and earthquakes occur on plate margins. But, do some of them also occur within plates?
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1answer
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Geological evidence about climate change: has there ever been a period with a rate of climate change as great as it is today?

Most statistics about climate change are based on climate data over the last 150 year (as long as records have been kept). This seems irrelevant in terms of the geological time scale of temperature ...
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3answers
187 views

Why are the mountains predominately grey or dark brown?

Observing many photos of mountains one can assume that most of the mountains are grey or brown. See also the mountain article at Wikipedia. There are however several ways a mountain can form, which ...
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2answers
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Is it possible to create clouds by pumping water into volcanoes?

Suddenly, there is this idea in my mind that if an important effect of global warming is rainfall reduction and drought, is it possible to use volcanoes as water vaporizers (regardless of costs)?
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What is this heavy rock having gold-olive colour and tiny gold coloured crystals?

The rock is very heavy, about 1.2 kg and 5 inches (~ 13 cm) long, gold–olive colour. The back has tiny gold coloured crystals and the front has bigger ones as seen in the picture. I don't really know ...
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What can one come to know about a mineral just by knowing name

I have been busy learning the components of various minerals for upcoming test....is there any way to predict the components or properties of a mineral just by knowing it's name? Eg: albite,augite, ...
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98 views

Is this a fossil

It this a stromatolite fossil? If it is, it’s probabaly at least 1 billion years old
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1answer
436 views

What kind of green rock is this? [closed]

Just wondering what kind of rock this is. I found it near an old home that was built in 1882 in Kansas. It is very heavy and it has a dark green tint to it. Probably about 6 lbs.
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1answer
100 views

I found this huge rock crystal by the river have no idea what it is?

![crystal rock yelowish to red yellow to orange has 3 layers of crystal )
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How big does something have to be to cause an atmospheric event upon entry to the Earth's atmosphere?

The question is about a foreign object, ranging from an asteroid to a spaceship. How large does it have to be in order for its presence to start messing with the weather patterns, causing the like of ...
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What kind of gem is this

I had got this as a kid and I am wondering if it is worth anything.
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1answer
100 views

Does crustal thickness have anything to do with how life existed and sustained on Earth? [closed]

The original question that was put on hold "If the crust were the thickest layer of Earth, what effect would its thickness have on organisms?" was actually one of those 'counterfactual question' ...
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1answer
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How does this melted-wax erosion pattern form in sandstone?

How does this kind of erosion pattern that looks like melting wax form in sandstone? Can you describe the kinds of processes and kinds of rocks that are needed for this? I've seen it in Nevada, but ...
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1answer
104 views

What on Earth in can repel a magnet? [closed]

The iron in blood is naturally repelled by a solid magnet the opposite of iron outside of blood by a magnetic field and I wander... Are there any elements that are repelled by a solid magnet? https://...
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0answers
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Identifying rocks, minerals

I am sorry to bother you.. before passing away, my grandfather gave me a special box that contained all types of beautiful, colorful rocks and minerals. I am having a hard time identifying them! Could ...
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ALOS Palsar SLC data products for geological mapping

I have some ALOS palsar SLC data products which are downloaded from ESA database and they are processed with ESA ALOS-PALSAR IPF processor which is different from JAXA. Formerly it was not possible to ...
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1answer
233 views

Metallic rock identification from Ontario Canada

This rock was found in Lake/Lac Clair near Sturgeon Falls Ontario Canada in about 2 feet of water next to the edge of the lake. It can easily fit in my hand. You can see a size comparison in the ...
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2answers
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Is an underground mine collapse or a tunnel collapse called a sinkhole?

Imagine there's an underground man made structure e.g. a tunnel or an underground train station that collapses creating a depression in the surface. Would that technically be called a sinkhole? What ...
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1answer
202 views

Dark heavy rock

I found this dark heavy rock near Wombeyan Caves NSW. Australia. It is 9 by 6 cm and weighs 353g; it is not magnetic and was found in a dried up riverbed.
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1answer
52 views

I need help to identify this Stone [closed]

I would like help to identify this Stone. I have found a large amount of these stones in my yard. I would just like to know if they are worth anything or if I'm just going to have a pretty driveway ...