Questions tagged [water]

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6
votes
0answers
435 views

How much of Earth's surface would be covered by water if all ice melted? [duplicate]

I'm trying to find how much water would be on the surface of Earth and how much surface would it cover (how much land will remain) if all the ice at the North and South Poles (and everywhere else) ...
40
votes
10answers
25k views

Why is the pond in my backyard not frozen when it is -15 °C (5 °F) outside?

I am in O'Fallon, Missouri and today it is -15 °C (5 °F) outside. I was taught water freezes at 0 °C (32 °F). I could understand if it was exactly 0 °C (32 °F) that the water might not be turning to ...
6
votes
1answer
70 views

Is the giant impact hypothesis still alive?

It used to be thought that the unusual amount of water on our planet was the result of a giant collision between proto-Earth and a dwarf planet or planetoid called Theia. I recently heard of some ...
12
votes
1answer
243 views

How different is the proportion of heavy water ($\ce{^2H2O}$) in the different oceans?

The average proportion of naturally occurring semi-heavy water or deuterated water, $\ce{^2HHO}$ or $\ce{HDO}$, is about 1 molecule in 3200. The proportion comes from the fact that one hydrogen in ...
3
votes
1answer
257 views

How are biological oxygen demand and depth related?

What is the relation between biological oxygen demand (BOD) and depth? I need to calculate the BOD of a drinking water tank and I have ultimate BOD at the surface of water, but I need to calculate it ...
6
votes
1answer
250 views

What would happen if the same soil received waste water contaminants for a long time?

I know that soil is used to filter septic systems within our treatment system, however what happens to this soil that is used in filtration, I know it would be changed every once in a while but what ...
18
votes
2answers
564 views

Is this ice cover real - and what circumstances are required to make it?

The title says it all... I assume it requires very slow freezing sheltered from the wind. Undercooled water, maybe? A Reddit thread talks about Delaunay triangulation, but that does not explain how ...
0
votes
1answer
767 views

What's the difference between Waste Water Reclamation and Waste Water Reuse? [closed]

I receive a project which there's the follow topic: Waste Water Reclamation and Reuse Are they not the same meaning, reuse and reclamation in this case?
10
votes
1answer
864 views

How does evapotranspiration affect rainfall?

Evapotranspiration is when a plant evaporates water off the surface of its leaves in order to move water throughout its system with cohesive and adheisiveforces. My question is how will a sudden ...
11
votes
2answers
176 views

What ice phenomenon are we seeing in this video?

I don't know what this YouTube video shows, but it appears to be half glacier and half "the blob." It almost appears to be "growing" although I assume it's being pushed somehow. Can someone tell me ...
6
votes
2answers
2k views

How would the Earth look without water in the oceans?

Has there ever been a movie, a documentary, or an image that provides a visualization of the oceans without water? I'm writing an article on geology and I thought a visual representation would be of ...
10
votes
2answers
579 views

How much land does it take to support New York City?

New York City has about 8.5 million people living in an area of 300 square miles which gives a population density of 28,300 people per square mile. The food required to support such a high population ...
24
votes
7answers
26k views

Is a complete global flood physically possible on Earth?

Genesis 7:11-20 presents an account of a precipitation event which, in 40 days, submerges the entire surface of the earth: [On] the seventeenth day of the second month — on that day all the ...
3
votes
2answers
904 views

What is the life-cycle of agricultural water used to grow crops/animals?

A là this Slate article: 1 gallon of water is required to grow a single almond 220 gallons to grow a large avocado 5,000 gallons to grow 1 lb of beef None of these things weighs anywhere near ...
11
votes
0answers
128 views

Using sodium chloride load as a point source pollutant variable in SWAT model?

I'm currently working with the Soil & Water Assessment Tool (SWAT). My task is to model the loading of sodium chloride into streams. One approach I would like to take is to use the point ...
12
votes
2answers
10k views

Water veins underground causing health problems

It seems to be given that around my country everybody believes in water veins (that's the best that Google Translate could come up with. Basically underground water currents) that somehow affect ...
5
votes
0answers
65 views

Why is seawater saline? [duplicate]

Why is seawater saline and not fresh? Could it be saturated with anything else, like, say, dissolved metal?
30
votes
4answers
35k views

Is it possible for rivers to freeze completely and stop flowing?

Is it possible for rivers to freeze completely in the winter and stop flowing? Are there known examples of this? If yes, how large can these rivers be and where does the water go? There are several ...
13
votes
1answer
534 views

Where does the water from rain in rain forests come from?

When discussing a hypothetical world without oceans and just forest it occured to me that I wasn't so sure there would be any rain in the first place, due to the lack of oceans. Searching on Google ...
10
votes
1answer
172 views

Sudden Localized Surface Water Temperature Increase In Eastern Lake Superior, Canada

As can be seen in the below sequence of NOAA images spanning 15 hours (most recent at top), in extreme eastern Lake Superior the surface water (but not bottom water) temperature increased dramatically ...
5
votes
0answers
152 views

Freshwater changes in time?

Taking freshwater as being: Fresh water is naturally occurring water on the Earth's surface in ice sheets, ice caps, glaciers, icebergs, bogs, ponds, lakes, rivers and streams, and underground as ...
19
votes
1answer
1k views

What fraction of dry land is below sea level?

Someone just asked me if it would be practical to counter the rise of sea level by pumping water into storage on land. It struck me that if there is enough land below sea level, this would require ...
18
votes
2answers
8k views

What does it mean for waves to “feel” the bottom?

While typically waves are said to "feel" the bottom when the depth of the water is less than half the wavelength, what does it mean for the waves to "feel"? Furthermore, why does this happen at the ...
34
votes
3answers
2k views

How would plate tectonics differ if Earth had no water?

Water plays a crucial role in plate tectonics by easing the brittle and ductile deformation of the Earth's lithosphere. Water lowers the Mohr-Coulomb for brittle fractures. During ductile deformation, ...