Questions tagged [water]

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23
votes
8answers
10k 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 ...
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
1answer
73 views

Ground water is almost every where, then how do mines and other holes are digged so that ground water doesn't drain into it

Water finds it way to the lowest point because of gravity. So if we dig a mine or something same, then how we take ground water in account, so that it doesn't fill in.
11
votes
2answers
192 views

Waves on sandy beach separating differently-sized rocks?

I recently went to a beach, and I noticed that the sand seemed to have a few distinct regions. I'm wondering what would cause this, and how it works. One region is the part of the beach which is ...
0
votes
1answer
42 views

If gypsum turns into plaster around 210 F, is there any natural plaster deposits or formations out there?

For a while I have been working with gypsum I mined from a site in Utah, and I realized how low the temperature is to turn it into plaster, so I was wandering; has there ever been any cases of large ...
-3
votes
1answer
75 views

How does one scientifically define drinkable water? [closed]

Honestly I think nobody's invented a good water desalination device because nobody knows the scientific definition of clean drinking water. So scientifically, what is the definition of clean fresh ...
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 ...
-1
votes
1answer
46 views

A pipeline from the ocean to the desert causing a climate change for a drout in california a good idea? [duplicate]

If I already had a crew that built a pipe line in california from the ocean to the sahara how long would it take to wet the dry lands with rain water and what kind of weather or cliamate change would ...
3
votes
1answer
199 views

How much energy would be required to actively reduce the temperature of the oceans of Earth by 1℃?

Is there a way to calculate the energy required to reduce the heat of oceans? Am I wrong in thinking it is not as simple as reversing the calculation for specific heat of sea water?
5
votes
1answer
61 views

How can flood inundation vary at the same river stage?

I've always thought that river flooding would always be the same at the same river stage. For example, if the river stage is at 20' flooding at location "x" would always be at the same depth. ...
18
votes
6answers
14k views

Why doesn't the 71% water of the earth dry or evaporate?

Perhaps a simple question, we know 71% of the earth's surface contains water as oceans. If Earth's age is 4.543 billion years, then I guess it should be decreased with drying or should have been dried ...
0
votes
1answer
134 views

Where on Earth is the most windless lake with its own micro climate sea breeze?

Would a circular lake have enough of sea breeze strong to create a gentle vortex in the center of the lake? Is there such a place on Earth where lake micro climate vortexes occur frequently? The ...
1
vote
1answer
318 views

Can a microGPS tracker trace the path of an underwater drainage conduit?

The Devil's Kettle is a pothole in the rock where a small river disappears underground in the Judge C.R. Magney State Park in Minnesota. Would it be possible to trace the path of the drainage conduit ...
2
votes
1answer
56 views

At what point are water droplets too small to make a rainbow?

This question asks How to tell if fog is made out of water droplets or ice crystals? I know that ice fog makes a rainbow where fog does not. Ice crystals aside: How does the water droplet size ...
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) ...
11
votes
6answers
4k views

If water is a renewable resource, why is there water scarcity?

Water is a renewable resource, renewed by the water cycle. If we use water too quickly, water should get evaporated and come down again as precipitation. So, Why is there water scarcity if water ...
9
votes
1answer
723 views

How much water is the atmosphere losing to space?

Up until recently, I was under a (wrong) impression that the amount of planetary cumulative water resources was finite as I believed its escape from the atmosphere was impossible. I believed that, ...
13
votes
3answers
11k views

Would oceans regenerate if removed?

On Earth, there is enough Hydrogen and Oxygen to make 13,88 million km$^3$ of water (calculation below). However, oceans contain only a tenth of that. Clearly, most of the hydrogen must be stored in ...
1
vote
1answer
216 views

How much water gets consumed by residential use versus all other uses?

I have read different statistics on residential water use. One EPA chart I saw had residential use of water taking up half of all water, which seems unbelievable to me. Another writer claimed that ...
8
votes
1answer
118 views

Is water actually blue or is it transparent?

This is my first post on StackExchange and I would like to ask a question: Is water actually blue or is that just the reflection of the sky?
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 ...
2
votes
0answers
97 views

Is there an approximate rate for water temperature by depth that could be modeled simply?

I know that there are a couple of questions covering latitude and longitude for water temperature, but overall I'm more interested in the rate of temperature change by depth. Thought Process: ...
2
votes
1answer
53 views

How is phosphorus getting into lakes and rivers?

Apparently there is so much phosphorus in waste water streams that states are passing laws to exempt water treatment facilities from having to spend billions removing the phosphorus. I don't get this....
8
votes
2answers
988 views

Was the filling of the Three Gorges Dam's impact on the Earth's rotation rate detectable?

I'm a big fan of Vsauce and the video How Earth Moves is just one example of science related to the Earth available there (there's plenty more). But the statement in this video starting at ...
0
votes
1answer
55 views

Glowing Orange lakes seen from airplane at night

I recently observed a phenomenon during a nighttime flight over upper Midwest of USA-specifically over Marquette, MI. In what is a lightly populated area, I observed several very large rectangular ...
5
votes
2answers
2k views

What keeps water from sinking into earth?

I remember reading somewhere that there's evidence of water on Mars but it all sank into the Martian soil. So what prevents that happening on earth? Some people say it's because the crust is not ...
13
votes
3answers
3k views

How is it possible to use up the water in a region?

The Dead Sea, rivers in California and the Aral Sea are said to be shrinking due to water usage, e.g. for agriculture. Yet the water must go somewhere. After the fields are irrigated, the water ...
4
votes
0answers
52 views

Are there places with water hardness between 30 dGH and 50 dGH?

In the manual of my new dishwasher there is a table of values of water hardness. It goes until 50 dGH (degrees of general hardness) which corresponds to 9,0 mmol/l in the same table. From wikipedia: ...
6
votes
2answers
97 views

Aren't fresh water deposits renewed by water cycle?

I have recently watched "How Many People Can Live on Planet Earth?" documentary with David Attenborough. In it, in the main factors that will limit total human population Earth can support the limited ...
1
vote
1answer
140 views

What is the cause of temporary smell and black color of underground water?

We have a well (about 1200KM away from sea and 60 meter deep), the water when taken out has slightly dark color and has smell. But strangely in about 12 hours the smell and black color vanishes and ...
3
votes
1answer
234 views

water (or hydrological) year around the world, does it change?

Following the commonly-known USGS definition of Water Year (or Hydrological Year) we know that it starts on the 1st October and ends on the next 30th September. Is this definition valid only for ...
1
vote
0answers
31 views

Environmenal flow in the context of global gridded hydrological analyses

Environmental flow (EF) is a widely used concept in river basin management and river ecology. There are more than 200 methods to estimate the flow that should be left to the rivers to ensure a ...
7
votes
1answer
89 views

Is salt accumulating over time?

The rainfall leaches salts (Mg,Na,Ca,K,.., Cl) from weathering rocks, where those ions were freed from chemical bonds by sunlight, acidic water etc. The runoff eventually goes into the oceans, where ...
7
votes
2answers
182 views

Does Earth risk losing its oceans to space due to global warming?

I read that we are facing the very real possibility of Earth's average temperature rising by more that 2 degrees Celsius by the end of the century. As I understand our planet is constantly loosing ...
5
votes
1answer
140 views

Judging wind speed based on flags and inland-water observations

About a year ago, I took this video along the Hudson river in NY, and I'm trying to figure out the Beaufort number based on the water and the flags. https://www.youtube.com/watch?v=nqjvTALRWW8 The ...
10
votes
3answers
414 views

Will the oceans swallow all of the land?

I am wondering why, since the oceans could feasibly hold all of the dry land, they in fact do not. For example, the Mariana Trench drops to -10.9km, while Mount Everest only reaches to +8.8km. ...
1
vote
0answers
15 views

Does outgassing change the isotopic D/H ratio?

It is known that the D/H-ratio of Earth's water inventory is very similar to that of asteroids. This is usually interpreted in a way that Earth's water must have come from similar, asteroid-like ...
4
votes
0answers
52 views

How is the vertical distribution of water vapor changing?

In this publication about data assimilation and observations (paywall alert) in the chapter General Concepts in Meteorology and Dynamics (by Andrew Charlton-Perez, William Lahoz, Richard Swinbank, ...
2
votes
2answers
124 views

Searching for ground water

I would like to attempt to build a well-type structure in a woodland area. This woodland is mainly inhabited with Silver Birch and Sycamores and there is a shallow stream running down off of a ...
5
votes
2answers
123 views

Comparing Pros and Cons of SWAT and HSPF

To model hydrology in a watershed, two of the most famous and widely used distributed models are SWAT and HSPF. I have some good understanding of HPSF, but I don't know when and why should one prefer ...
5
votes
3answers
89 views

Transferring water using underground channel

I heard in tv show, there are water channels in underground like rivers or small channels! So I just wondered why don't we use such underground water channels to recharge the underground water of one ...
3
votes
0answers
61 views

Endogenous Theories For the Origin of Earth's Water (Dry/Wet Accretion?)

I have really two questions: (1) what evidence is there in favour that the majority of Earth's water formed with the planet. (2) what evidence is there that the majority of water did not form with ...
2
votes
1answer
36 views

How we can find hot spring genesis time?

Is there any way we can calculate the time when a particular hot spring come into existence? Also I wanted to know what is average time period for a active hot spring in general, whether it can flow ...
3
votes
0answers
46 views

What does the motion of water in tsunamis look like?

This is what normal wave motion looks like. Do tsunamis that travel at 60mph look any different?
1
vote
0answers
60 views

Easiest way to find the water table under my feet

I had burnt my finger by digging an empty well and spending my hard-earned money in vain. I then started to study about the resistivity method for finding underground details. But I have many doubts ...
2
votes
0answers
135 views

How much ocean water is currently being displaced by ships?

According to Statista, as of January 2017, there are approximately 52,000 ships currently operating in the merchant fleet and 11,000 of these are considered bulk carriers. How many ships are there ...
8
votes
3answers
717 views

Why is my pond / lake melting when the temperature is still far below freezing?

I recently moved into a new house with a 2 acre lake behind it. We’ve had 15 consecutive days below freezing, and the last 12 of those have been below 20 degrees (Fahrenheit)! Six days ago I shoveled ...
3
votes
1answer
348 views

Does global warming affect tsunamis?

I have been doing some research into global warming, and I was curious as to whether or not increasing the temperature of the oceans would affect tsunamis to any significant degree. My gut tells me ...
3
votes
1answer
144 views

Is there enough water to cover the surface of a topographically normalized earth?

Is there enough water in the oceans, ice caps, rivers and streams to cover a completely flattened earth, in proportional to land volume and water volume?
-1
votes
1answer
35 views

How would one get a submarine to rise? [closed]

How do you get a submarine to rise from the bottom of the ocean to the surface again? Do you press a button? Flip a switch? Use a lever? How do you initiate the surfacing process?