Heat & pressure.
the plates slide in place
The asthenosphere is the layer of Earth that lies at a depth 60-150 mi (100-250 km) beneath Earth's surface.
The object expands
A surface has area but no depth. Therefore the Earth's Surface has a depth of 0.0 kilometers.
The focal depth of an earthquake is how far beneath the earth's surface the hypo-center of the earthquake.Because of its location in the Indian Ocean, however, its focal depth is measured as 30 kilometers below mean sea level, rather than being measured at the seabed.
the plates slide in place
Absolutely.
Both temperature and pressure increase with depth.
it increases
A flat surface is no more that a plain horizontal surface with no depth. For example the surface of a table top is a flat surface, that is the surface only, not the depth of the top or the rest of the table
The asthenosphere is the layer of Earth that lies at a depth 60-150 mi (100-250 km) beneath Earth's surface.
blue
30 degrees Celsius for each kilometer of depth near Earth's surface
10.3 m
The object expands
A surface has area but no depth. Therefore the Earth's Surface has a depth of 0.0 kilometers.
There are a number of things that could happen to the salinity of an ocean if it's depth increased. The salinity would likely also increase.