Community Digest

Top new questions this week:

Wasn't Earth a magma ocean before the Iron Catastrophe?

I've always thought that the process of planetary accretion was energetic enought to keep the proto-Earth entirely molten, and that the subsequent evolution of the planet (the formation of the crust, ...

planetary-science geothermal-heat planetary-formation iron  
asked by Swike 4 votes

Why is the concentration of highly siderophile elements so uniform in the mantle?

The plot above is about the concentration of siderophile elements in the terrestrial mantle. From the logarithmic plot, we can deduce that the concentration of highly siderophile elements is quite ...

asked by adwait naravane 3 votes
answered by Jean-Marie Prival 5 votes

Is pollution the reason why rainbows are so rare nowadays?

Today I saw a rainbow after almost a decade. I live in Noida (a city) in India. Most people I know believe that: we don't see rainbows nowadays because of pollution and now after nearly 3 months since ...

meteorology air-pollution rain  
asked by Manik 2 votes

How do mountain springs get their water?

I am curious how do mountain springs get their water. The water flowing from them eventually forms rivers. Is it only from rain and snow? Or does water also come from underground-below the mountain ...

water mountains  
asked by Cristian M 2 votes

Why does the Earth have more aluminum than magnesium while the Sun has more magnesium than aluminum?

Magnesium represents 0.07 % of the composition of the Sun's photosphere while aluminum represents 0.006 %. Therefore, there is much more magnesium than aluminum in the Sun's photosphere. But the same ...

planetary-science crust planetary-formation  
asked by URIZEN 1 vote
answered by Gimelist 4 votes

How is Air Quality Index relevant to both PM2.5 and NO2

I am comparing NO2 and PM2.5 levels in the pre-2020 Jan-April and 2020 Jan-April (representing air quality during lockdown and under no-lockdown conditions). The data was from the aqicn website ...

asked by Amelia 1 vote
answered by farrenthorpe 2 votes

Is the slowing down of the Atlantic meridional overturning circulation a response to climate change?

I have been taught that the changes in current were caused primarily by climate change but upon reading the conclusion of the paper named: "Observed decline of the Atlantic meridional overturning ...

asked by hello 1 vote

Greatest hits from previous weeks:

Why is the Ocean water on the west Coast so cold comparing to the East coast?

Even at similar latitudes they appear to be quite different from one another.

ocean temperature  
asked by reddit 7 votes
answered by Jareth Holt 15 votes

Why doesn't the sun reach its highest point overhead at exactly 12:00 noon?

Many sources state that 12:00 noon is the high-point or mid-point of the sun's path across the sky. However, for where I am, this is obviously wrong. In my own town the high point of the sun occurs ...

meteorology seasons  
asked by Ian Paschal 20 votes
answered by Fred 36 votes

Is oxygen the most abundant element on Earth?

When I was in school, I was taught that we need oxygen to breathe, but it actually constitutes only a small fraction of the atmospheric composition, and that nitrogen constituted the largest fraction ...

atmosphere geochemistry nitrogen oxygen  
asked by Matthew Layton 8 votes
answered by bon 11 votes

How has and how does the lithosphere affect climate change?

The climatic system can be divided into five main components: the atmosphere, the hydrosphere, the lithosphere, the cryosphere and the biosphere. All these physical systems operate at different time ...

climate climate-change paleoclimatology lithosphere  
asked by Isopycnal Oscillation 13 votes
answered by Tactopoda 11 votes

Global warming - why doesn´t mankind collect heat (thermal energy) and turn it into electricity or send it to space?

Why doesnt mankind "collect" thermal energy (there has to be some way: thermal couplings, detour over chemical energy, whatever) and after it has been concentrated at one point, turn it to electrical ...

climate-change thermodynamics  
asked by Martin Eckleben 28 votes
answered by Semidiurnal Simon 28 votes

Is there sand in Antarctica?

There's a song "Blizzard's Never Seen the Desert's Sand". Given Antarctica is a desert, someone questioned the title's validity. BUT is there sand in Antarctica? I'd imagine yes as it's a pretty ...

geology sedimentology soil geomorphology antarctic  
asked by cr0 26 votes
answered by Christopher Klaus 45 votes

At what humidity does it start to rain?

As far as I understand it is perfectly valid for air to have 100% humidity. At that point, all water can still exist in form of vapor, non-condensed. Does it immediately start to rain if humidity is ...

meteorology humidity rainfall  
asked by Thomas Weller 30 votes
answered by casey 28 votes

Can you answer this question?

Why some area in the ocean seems to have like "wind barrier"?

When looking at the earth wind map, some lines clearly distinguish themselve and act as "frontier" between stream of wind. I was wondering what it was and what was causing them? Thanks.

asked by maalls 1 vote
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