Community Digest

Top new questions this week:

How to make Martian soil

My son wants to replicate some experiments and try to grow plants in Martian soil for his A-level science project. I know NASA have managed to produce soil that mimics Martian soil, however I also ...

geology soil mars soil-science  
asked by Magic Bullet Dave 12 votes
answered by ebv 8 votes

How is global greenhouse gas emission calculated?

I am sure there are different methodologies to arrive at such a number. Can someone in layman terms describe some of the most widely used and trusted methods and what data are used? Sorry I am outside ...

climate-change climate-models earth-observation  
asked by RicardoR 12 votes
answered by gerrit 10 votes

Why have "ozone-depleting substances" led to a third of all global warming and half of arctic sea ice loss?

According to the article "Ozone-depleting substances caused half of late 20th-century Arctic warming, says study" (emphasis added): A study published today in Nature Climate Change by ...

atmosphere climate-change atmospheric-chemistry sea-ice  
asked by uhoh 9 votes
answered by gerrit 8 votes

Plotting ERA5 U/V Wind Data Using Python

Hello Earth Science Community, I am a beginner Python programmer trying to plot a single time step of 10m surface wind data I grabbed from the ECMWF ERA5 reanalysis single level dataset in Python ...

meteorology wind era python visualization  
asked by mariandob 7 votes
answered by gansub 9 votes

How are barometric pressure measurements traceable over centuries to 100 parts per million accuracy?

The BBC News item Barometric pressure in London 'highest in 300 years' at least begins with Overnight, Sunday into Monday, London's Heathrow Airport recorded a barometric pressure of 1,049.6 ...

measurements barometric-pressure instrumentation calibration  
asked by uhoh 6 votes
answered by Mark 7 votes

Considering the thin piece of material on the surface of Mars in the image below, is there anything like it on Earth?

The above is a magnified part of the original image below captured by the Curiosity rover on Mars on sol 1729 (June 17, 2017). From the added information with that raw image it can be estimated ...

geology geochemistry mars  
asked by Conelisinspace 6 votes
answered by trond hansen 2 votes

What are the differences between down-looking and side looking radar?

In Radar concept the SAR-Synthetic Aperture radar performs as side-looking to collect information, why it is not downlooking? There are down-looking radar also. So what are the differences between ...

asked by Gokul Anand 4 votes
answered by Michael Walsby 1 vote

Greatest hits from previous weeks:

Does human body temperature impact climate change?

The human body temperature is about 37 °C (99 °F), so as the population increases does this cause the Earth's temperature to rise?

climate-change temperature human-influence earth-system  
asked by user11473 22 votes
answered by David Hammen 35 votes

How does the Sun heat the Earth?

The core of the sun has a temperature of 15,000,000 °C. The surface of the sun has temperature around 5,000 °C. The sun is around 93 million miles (150 million km) away from earth. My Question: ...

temperature planetary-science earth-system atmospheric-radiation  
asked by PCmedia 10 votes
answered by farrenthorpe 2 votes

Why do climate experts from the UN/IPCC rarely mention Grand Solar Minimum?

I've read many papers about Grand Solar Minimums and Glassberg Minimums, known to science for a very long time, and studied and monitored with many public funds. History shows solar activity is the ...

climate-change paleoclimatology solar-terrestrial-physics  
asked by daniel brastaviceanu 1 vote
answered by Camilo Rada 79 votes

Why is Earth's inner core solid?

I have never understood why earth's inner core is solid. Considering that the inner core is made of an iron-nickel alloy (melting point around 1350 C to 1600 C) and the temperature of the inner core ...

geophysics core  
asked by tux 36 votes
answered by Chris Mueller 32 votes

How is the mass of the Earth determined?

According to textbook knowledge, the mass of the Earth is about $6 × 10^{24}\,\mathrm{kg}$. How is this number determined when one cannot just weight the Earth using regular scales?

geophysics geology  
asked by Kenshin 35 votes

Is soil a renewable resource?

My geology textbook tells me that soil is not renewable, and I agree with this, but there was some question in my class as to whether this is true. Some soils take more than a human lifetime to ...

resources soil  
asked by Inkenbrandt 12 votes
answered by decvalts 12 votes

Is Mount Everest currently becoming taller or shorter every year?

Is Mount Everest becoming taller or shorter every year? By how much? I would like an explanation in terms of tectonic plate movement if possible. Source:

geology mountains  
asked by Poomrokc The 3years 11 votes
answered by Richard 17 votes

Can you answer these questions?

Median earth temperature development in 20th century

Are there graphs with the median temperature development in the 20th century and if not, is there readily accessible data that can be used to calculate it? Median is statistically more stable, at the ...

climate-change global-weirding  
asked by Philip 2 votes

Waves in very thin layer

Elastic waves in the earth are described by the elastodynamic equations \begin{align} \rho \frac{\partial^2 u}{\partial t^2} &= (2 \mu + \lambda) \frac{\partial^2 u}{\partial x^2} + \mu \left( ...

geology geophysics models  
asked by Frederic 2 votes

Why is the level of UVA radiations on the earth surface the same throughout the day, while the level of UVB significantly varies?

I read on UVA maintains the same intensity all day, which makes dawn-to-dusk sunscreen use important Whereas on ...

asked by Franck Dernoncourt 2 votes
answered by Michael Walsby 0 votes
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