# All Questions

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7 views

### Why estimate evapotranspiration using machine learning techniques while we can calculate it with Penmann monteith equation?

I find many researchers use Machine Learning Techniques and Algorithms to calculate the reference EvapoTranspiration, while there’s also the Penmann Monteith equation that gives us the result. Does ...
1answer
30 views

### Isn't a warmer climate better for energy generation?

Nowadays, everyone talks about it: climate change, and more importantly, how to stop it from happening. Although there's a lot of debate around the topic, the conscensus is that by inventing a way of ...
2answers
60 views

### Why is carbon dioxide the gold standard in greenhouse emissions - and not nitrous oxide?

I admit that this is not a genuinely earth sience question, but since there is no stack exchange site genuinely devoted to general ecology, I dare to ask it here: From a table in the German Wikipedia ...
4answers
3k views

### Why does the salt in the oceans not sink to the bottom?

This is something that just occurred to me. If heavier elements sink, then how can the entire ocean be salty? Shouldn't the 'salt', because of its density, all sink to the bottom of the ocean? In ...
2answers
34 views

### A better way to prevent ice shelf from melting and raising ocean levels?

I just read this article by scientist who propose making giant snow machines to basically move the eroding ice shelf further inland. It’s been described as pretty much cost prohibitive (despite saving ...
1answer
62 views

### Collecting rock's for rock garden, found this

Found along the Sandy River, Oregon. Black with brown patch, low luster, greasy texture, less then 5 hard, heavy as 3 AA batteries.
0answers
14 views

### How to draw a strike and dip on a geologic map?

I know that Strike and dip refer to the orientation or attitude of a geologic feature. The strike line of a bed, fault, or other planar feature, is a line representing the intersection of that feature ...
0answers
39 views

### is it better to take minimum measure of all measures or the mean of minimum measures as a minimum measure

We have taken the measurments of temperature, humidity, net radiation and pressure in our lab so we can calculate the potential reference EvapoTranspiration. So to find out the potential reference ET ...
5answers
5k views

### How and why did the oceans form on Earth but not on other planets?

Earth is the only planet in our solar system that has copious amounts of water on it. Where did this water come from and why is there so much water on Earth compared to every other planet in the ...
1answer
44 views

### Realtime planetary gravity maps?

I'm trying to find maps of realtime (or at least periodically updated / semi-realtime) gravity maps of Earth. I was hoping that GOCE might have something like this available, but I've been hitting a ...
4answers
3k views

### Do hurricanes cool the earth?

I noticed that temperature drops in the surrounding area of a hurricane. Is the heat converted into kinetic energy? Could the shape of the hurricanes reflect sunlight? Do they create more lightning ...
0answers
38 views

### May i ask what mineral is this.. ? Thank you so much. I came from philippines [on hold]

We found this crystalized piece of rock in our mountainous place at iligan city philippines at island of mindanao. This only 1 piece of rock i havent seen any like this around the area. The size ...
1answer
124 views

### Please identify this rock

I found this rock along the Illinois river basin in cave junction, oregon. It was laying on the top layer of a massive beach of rock. It's shape is what drew me too it, then after closer inspection ...
0answers
32 views

### Please identify this rock for me! [on hold]

I found this, on the beach in somalia. Can you guys tell me what kind of rock is it. I am unable to identify it. And I don't know where to get the info on it.
0answers
41 views

### Can anybody tell me what kind of rock this may be [closed]

A black gold cristal rock I found
2answers
2k views

### What are these metallic nodules that were found at low tide on the UK south coast?

Smooth spherical crystalline metal nodules Outside and inside surface does not scratch with a knife blade Inside lustre brassy, radially striated metallic crystals radiating from a lumpy centre at the ...
1answer
132 views

### Would a volcanic winter trigger an oceanic “spring”?

There is large amounts of observations supporting the effects of volcanic eruptions on climate: A long term subtle warming effect due to $\ce{CO_2}$ and a short term, but more intense cooling effect ...
1answer
43 views

### Why is diabase/dolerite erosion resistant?

Diabase is often considered to be relatively erosion resistant. We can generally find diabase dikes cross-cutting various strata through the geologic landscape, wherein, the diabase dike or sill is ...
1answer
589 views

### What is the metamorphic field gradient useful for?

As I understand it, the metamorphic field gradient is the PT line traced out by the maximum temperature points of a series of PTt paths of rocks from the same metamorphic event. What exactly is this ...
1answer
29 views

### What kind of heavy rocks are these? [on hold]

Can anyone help me identify these rocks? Found these on the beach. They are VERY heavy but not magnetic. Most have a circular shape, about 1-2 inches in diameter. A few have a flat bottom. Any guesses?...
1answer
29 views

### Temperature of the earth [on hold]

What are the main factors that contribute to the temperature fluctuations/cycles of a location? Is the earth's temperature cycle dictated mainly by the temperature cycle of the ocean? How does the ...
0answers
17 views

### What type of rock is this? [on hold]

I have no idea if this is a mineral, quarts, geode or anything . Anyone know ?
5answers
469 views

### What is this geomorphological form?

What is this geomorphological form located at Vitrolles, France? And how is it formed? It is like a 'raised flat land', or a base of a hill where the top 80% is cut, leaving only the wide, flat base.
1answer
24 views

### This chalky outer layer rock or mineral with crystal tripe inside? [on hold]

Possibly flint in chalk? A friends late husband found these rocks somewhere unknown to us and we would like to know what they are the outside is white and has an interesting bumpy texture while the ...
0answers
49 views

### Is this particular multiple rainbow unexplained by science?

The gist of the BBC News article 'Incredibly rare rainbow' photographed in Highlands is that while it has several familiar features, there are aspects that are still unexplained. Question: Are there ...
0answers
13 views

### Why did notosuchians and similar crocodylomorphs thrive in the Jurassic-Cretaceous but fail to compete with adequate mammalian competitors?

Notosuchia has a long and storied past. They seem to have gotten by just fine with dinosaurs dominating the makeup of mid and late Mesozoic megafauna. Despite dinosaurs having more developed and ...
3answers
782 views

### How did plants adapt to $\small\sf{CO_2}$ levels past 400k years? Why won't they do it again?

(Description from climate.nasa.gov: This graph, based on the comparison of atmospheric samples contained in ice cores and more recent direct measurements, provides evidence that atmospheric \$\small\sf{...
1answer
35 views

### Hi please could someone help identify this rock. Received it as a gift from a friend [on hold]

The rock has green,purple and white stripes.
2answers
34 views

### Fossil in Chert pebble picked up on a Kent beach

Please identify the fossil in the picture below. size of pebble is around 40mm diameter and the pebble had been broken to reveal the internal structure.
4answers
268 views

### Considering how old the Antarctic ice cover is, why isn't it much thicker?

The Wikipedia article on the subject of the "Antarctic ice sheet" says that: The icing of Antarctica began in the middle Eocene about 45.5 million years ago and escalated during the Eocene–...
1answer
91 views

### I'm still confused about what “probability of precipitation” means

I'm trying to understand what weather forecasts mean more precisely. As I understand it from reading Wikipedia, blogs, etc., the percentage value for rain/precipitation that you see in a forecast is ...
3answers
3k views

### Can someone please help identify my rock

Can somebody please help. I found this rock on the beach in the south of England. It seems to have a number of small shards of what look like crystal or glass spread around it whilst the rock itself ...
1answer
26 views

### Can someone help me identify this rock? [closed]

I found this rock alongside a dirt trail in the Coconino National Forest in Sedona. Our tour guide said it was some kind of quartz, but I was wondering if anyone knew what type.
1answer
247 views

### What is the global distribution of oil filled geodes?

In a general 40 mile radius of Keokuk, Iowa many sedimentary geodes can be found. They are abundant in the Warsaw Formation with the type section at Geode Glenn in Warsaw, Illinois. In one specific ...
1answer
101 views

### Help to Identify a Rock Found in Gray Clay [on hold]

Found digging a pond. The rock was inside Gray Clay 18 feet below grade. The person who gave it to me tried cutting it with a grinder. This left an area that looks like steel. Location: ...
0answers
16 views

### Anyone sucessfully installed pywafo for Python 3 under windows OS?

I've tried: pip install wafo pip install wafo==0.3.1 The instructions of readme provide a 2 step installation process but it fails on the first one. I am using windows 10 and python 3.6.1. Right ...
0answers
14 views

### Why does the OSCAR database describe Landsats fire identification as “daylight only”?

The World Meteorological Organisation (WMO) Observing Systems Capability Analysis and Review (OSCAR) Tool describes the High-Resolution Imager (HRI) (which flies on Pléades-1A and -1B, among other ...
1answer
55 views

### Daughter found a unique rock at daycare in New Gloucester Maine

Daughter found a really unique rock and says its a meteorite (she's 5). We are not sure. She found it on the playground at school on the ground. It does have some magnetism to it (minor amount - ...
2answers
46 views

### Is this series of earthquakes near Broome, Australia normal?

There have been a series of earthquakes (some strong) near Broom, Western Australia. See this screenshot of the Geoscience Australia earthquakes map: I didn't believe there were any faults around ...
0answers
57 views

### Rock ID: black rock found in Central Europe

I'm note sure if it's an anthracite, augite, jet (lignite) or something completely different. I don't know where exactly i found it because it's from my old rock collection. I would appreciate your ...
1answer
32 views

### mineral identification request

Metallic luster Grey crystals, appear black in photo, grey streak With quartz Non-magnetic Softer than stainless steel blade, harder than fluorite =>hardness ~5 Found in California on the eastern ...
2answers
70 views

### Time standard for IERS Bulletin A

IERS Bulletin A and Bulletin B contains Earth orientation parameters. These include the time difference between UT1 and UTC and pole position. The values for these parameters are listed once per day, ...
0answers
32 views

### Found in Spain when exploring a mountain, what type of rock is it? [closed]

Please help me to identify this rock that I found whilst exploring a mountain in Spain Thankyou in advance enter image description here
1answer
28 views

### Discrete distribution of daily rainfall

How can I estimate the rainfall rate every ten minutes during a day having the total amount of rainfall during that day ?
2answers
469 views

### How do I convert a latitude/longitude coordinate to a NOAA GFS grid cell location?

Looking at this GFS http://nomads.ncep.noaa.gov:9090/dods/gfs_0p50/gfs20170707/gfs_0p50_12z.ascii?tmax2m[0:2][124:128][279:283] The range defined by the second and third set of brackets specify the ...
1answer
120 views

### Iron like rock in western pa, is this hematite? [closed]

Found this years ago when digging a garden here in western pa, finaly decided to figure out what it is. Its dull, but has thousands of very tiny crystaline specs, very ferus, even the “rocky” looking ...
0answers
60 views

### No way this title already exists!! BS [closed]

Found in landscape rocks at a house in Prior Lake MN USA. It was one solid rock with dull white spots on the outside and some pitting. Other than the white spots Its dull reddish and very hard. I ...
2answers
85 views

### What is this brown rock? [closed]

What type of rock is this? Anyone?
2answers
242 views

### What kind of rocks are these light-colored ones with shiny metallic inclusions? [closed]

My dad found these rocks in his garden. They have some shiny metallic looking pieces in them. Would anyone be able to identify what they are? We live in South Africa if that helps. Thanks!
1answer
98 views

### I found this stone with metal linings can someone identify it?

I am more curious about the metal on the surface (if it's even metal?) on this stone :) I don't really remember where I found it, probably at this beach of the Baltic Sea, but there is also a chance ...

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