# All Questions

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5 views

### Can someone help me identify this rock?

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.
8 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 ...
9 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 ...
23 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 ...
34 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 - ...
21 views

### Fossil in Chert pebble picked up on a Kent beach [on hold]

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.
40 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 ...
27 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 ...
27 views

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

Please help me to identify this rock that I found whilst exploring a mountain in Spain Thankyou in advance enter image description here
20 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 ?
34 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 ...
31 views

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

A black gold cristal rock I found
57 views

### No way this title already exists!! BS [on hold]

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 ...
41 views

### Please can you identify this that my Husband dug-up [on hold]

My Hysband dug this up the other day, and we would love to know what it is.
22 views

I currently read a few papers and one of them stated to forecast solar irradiance using measures of solar radiation. I hope this question is not trivial as I'm actually from germany, but if there is a ...
82 views

### Help to Identify a Rock Found in Gray Clay

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: ...
21 views

### How rare was Hurrican Barry's storm track?

Unlike most hurricanes that affect the eastern and central U.S. Barry did not form in the Atlantic. Instead it formed apparently from a low that veered into the Gulf of Mexico from the continental U.S....
21 views

### Does the feel of temperature change, when you're in two different places [duplicate]

I'm from Baltimore Maryland. And our summers can be very intense sometimes a heatwave could put us at 100 degrees and with humidity it could feel like 110 degrees. Now, I have friends from the U.S. ...
88 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 ...
14 views

### Get NPK values of soil without spectroscopy

I stumbled upon this new device called Teralytic. Which can measure salination, NPK values and all sorts of things. Unfortunately it's sold out and I think when it'll be available again rather ...
75 views

### Is radiocarbon dating based on assumptions?

https://benpiper.com/2011/07/the-truth-about-carbon-dating/ The site above explains that Carbon-14 dating is based on a few assumptions, like to deduce the age of an organism by looking at the amount ...
51 views

### What portion of global warming is caused by radioactive CO2 produced from cosmic rays?

The Earth's magentic field has been weaking recently, and the sun's magnetic field has been weaking recently, and it is a known fact that when either of these magnetic fields weaken (let alone both of ...
55 views

### Does subduction of continental crust happen at continental-continental convergent boundaries?

What exactly happens at a continental-continental (cc) convergent boundary? I read myself through the web for the last few days and what I came up with is that such a boundary will start as an oceanic-...
54 views

### wavelength of seismic wave with a gaussian source

i want to know how i get the wavelength/frequency of a seismic wave, if i only have a gaussian source and the velocity (c = 4000m/s) of a medium given. e.g. for a ricker wavelet it would be easy to ...
20 views

### Transmitter receiver coil separation for Electromagnetic Terrain Conductivity Measurement

Why increasing transmitter-receiver coil separation in EM survey (EM31, also here) increases depth of penetration? Suppose there is a horizontal flat conductive layer underneath a flat resistive ...
242 views

### If a specific mass of air is polluted, will the pollution stick with it?

Let us say a car pollutes 1m3 of air. Is that pollution attached to that specific air mass or will it fall to the ground or take its own path through the air, independent of the air it first polluted? ...
25 views

### Regional and Relative Sea level

I am a little confused by the terms "regional" and "relative" in the sea level change context. Do the two words have the same meaning? Does the "regional MSL trend" in https://www.aviso.altimetry.fr/...
55 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 ...
32 views

### Can we carbon-date the remains of homo floresiensis found in 2003?

According to the Wikipedia article on the species Homo floresiensis, the remains discovered in 2003 consist of unfossilized bones. I would assume that means they are still composed of the original ...
21 views

### Seismic amplitude distribution

Recorded (or raw) and processed pre/post-stack seismic data (relative amplitudes) usually display a standard normal distribution, albeit with a very small amount of skewness. What would be possible ...
22 views

### Seismic wavefield theory: velocity anisotropy

Does the reciprocity principle hold true in an anisotropic subsurface environment?
14 views

### How to determine the orientation of coastline from NetCDF file

I have a NetCDF file (gridded data) with a landsea mask. I would like to determine, for the coastal grid-cells, what the orientation of the coastline is. I need to do this in order to calculate the ...
44 views

### How would it affect the earth if we cover the whole atmosphere to avoid sun light for 24 hours? [on hold]

Just a curious thought about covering the whole earth atmosphere for 24 hours so that no sun light can reach the earth in that period? Would it reduce the heat on earth?
42 views

### In case of one or more tipping points is already reached, when will humanity go extinct? [closed]

Let's assume one or more tipping points have already been reached. When would be the earliest point from now on that humanity will go extinct? I know, that the maximum temperature a human can ...
31 views

### Shattered veined rock from Alberta, Canada [closed]

This rock was about 3-4 inches bigger than a basketball. When dropped it shattered into a couple large pieces and a lot of small ones. The inside was marbled yellow (almost like quartz); the marbling ...
21 views

### What California crystal/mineral is this? Is there a name for this type of crystal formation [closed]

I have a number of pieces of this very thin, flat, rock with olive green crystal in it (for lack of a more educated example) peanut brittle like structure. It's very light weight. None of the pieces ...
46 views

### Why is it hard to predict earthquakes?

An analogy I came up with is: Predicting earthquake strength and timing is like throwing a sheet of glass on the ground and predicting how many pieces it will break to and where they'll end up. Is ...
34 views

### What is the vertical axis of this waveform shown in this tweeted IRIS GIF?

This IRIS tweet shows a video of siesmic waves from the recent M6.4 Earthquake in California rolling across the US. I've made a small GIF to give the idea but the "GIF" in the tweet shows the whole ...
3k views

### Why doesn't sea level show seasonality?

North-hemisphere ice-shelf melts on summer and grows on winter. I would expect appreciable changes on sea-level between seasons, but sea-level looks equal on winter than on summer. Why doesn't sea ...
34 views

### Do earthquakes produce folds on rocks?

Earth rocks are frequently folded at surface. Folds in alternating layers of limestone and chert in Crete, Greece. Source: commons.wikimedia Are earthquakes the main mechanism ...
20 views

### How to calculate Lifted Index from ERA5 pressure level data?

I have taken a thunderstorm case where I need to calculate indices but I am not getting any code related stability indices in Python language, the code is available in GRADS, NCL for me it's difficult ...
64 views

### How do we know the rate of decay for radiometric dating is constant?

http://www.purdue.edu/newsroom/research/2010/100830FischbachJenkinsDec.html The link above talks about a research paper from Purdue University that the researchers had detected slight fluctuations in ...
48 views

### Found a light brown rock with concentric circles on it. Is it a fossil? [closed]

I found the rock in the picture while visiting Pawnee National Grassland (Colorado, USA). The rock shows concentric circles on both sides. On one side these circles are very clear, on the other side ...
39 views

### What types of rocks are these [closed]

I can’t figure out what type of rocks these are I would like to create pigment out of them to make a watercolor want to make sure they are safe, one is brick red the other is more of a deep magenta, ...
24 views

### What would the weather patterns on Earth really be like if Earth were tidally locked to the sun? [duplicate]

This question is different from How would weather change on a tidally-locked terrestrial planet?. None of its answers answer my question. I think it's answer might even have wrong information as I ...
44 views

### Possible and probable source of Curiosity Rover's $\small\sf{CH_4}$ detection on Mars

Past week, NASA announced Curiosity Rover measured 21 ppbv of $\small\sf{CH_4}$ on Mars. This week, NASA's Curiosity Mars rover found a surprising result: the largest amount of methane ever ...
33 views

### How does jetstreams lead to formation of heat waves in Europe?

Jetstreams move at an altitude of roughly 6-9km above the sea level. Since, it is moving at such a great altitude how could it have possible impacts on the land? And how will jetstreams that flow at ...
54 views

### What types of high-level mathematics are useful in doing climate modelling/meteorology?

I'm aware that PDEs, linear algebra, numerical analysis and such are staples of most applied mathematical endeavors. I want to know if there are other areas of "higher" mathematics that have useful ...