To the best of my knowledge, the water under the surface was formed when the oceans were formed, or thereafter. In simple terms, cracks in the ground allows water to leak below ground into large open voids.
This source is ocean waters.
The sun
About seven tenths if 71.1% of the earths surface is underwater and wow I am surprised nobody figured that out and answered this
During the devonian time period most of land was under water.
Runoff is the water flowing downhill across the surface of the Earth.
This source is ocean waters.
Water is evaporated from oceans, seas, lakes, rivers.
Most of the earths surface is covered with water. There is land under that water though, below the surface.
What needs a heat source to begin evaporating. Normally the sun is the heat source that evaporates water on the earths surface.
it is water cycle
70% or 80% of water covers the earths surface
The sun
3/4 of the earth's surface is water.
it will over flood the earths surface with melt water of the ice berg and detroy land under sea level
69%
about 30%
the sun