What is one reason water can remain in the liquid state on Earth? O A. Earth's gravity is strong enough to keep liquid water from escaping
into space.
O B. Earth's temperature varies because it experiences seasons as it
orbits the sun.
C. Earth's gravity is strong enough to keep water molecules close
together, forming a liquid.
D. Earth's temperature is high enough that water on the surface
cannot reach its freezing point.
Hey

Over three-quarters of the planet earth is covered with water. ... At room temperature (anywhere from zero degree centigrade to 100 degrees centigrade), water is found in a liquid state. This is because of the tiny, weak hydrogen bonds which, in their billions, hold water molecules together for small fractions of a second.

Explanation:

D. Earth's temperature is high enough that water on the surface

C or A...

Explanation:

I think the answer to this is actually pretty complicated, and has to do with chemical changes that take place in rocks during subduction. Rocks generally do like to absorb water (they become hydrated), but under the intense pressure and temperature of the subduction zone, the water molecules and the minerals become separated. I don't know exactly why this happens (I actually asked a couple of geochemists about it once, but I didn't know enough chemistry to understand the answer) but I think it's basically because dehydration is an endothermic reaction and a lot of heat is being supplied. Once this has happened the water is less dense than the rock and somehow makes its way back to the surface.

Having said that, the mantle probably isn't completely dry. I think it's very difficult to estimate how much water there is in the interior of the Earth, but some researchers think the moisture content is important for lubricating the movement of tectonic plates. But although they contain some moisture, rocks in the mantle are generally much drier than those on the surface. We know this because when new rock is exposed due to the spreading of tectonic plates, it undergoes hydration reactions that release a lot of heat.

So the the main forces that keep the water on the surface of the planet are to do with plate tectonics. If the plates were to stop moving, the water probably would eventually be absorbed into the interior, although this process would take a very long time indeed.

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