Approximately how much of the Earth's surface is below sea level?<span>70% of Earth's surface is under water.</span>
It's called the Geosphere, if it asks for anything else put the atmosphere with it.
It does not absorb the green wavelengths of white light.
Submerged basaltic volcanoes that are higher than one kilometer are called seamounts. Seamounts stem from the ocean seafloor, and can be found in the deep sea, usually made during a volcanic eruption.