As a sample moves from point a to point b in this diagram, what happens? temperature (c) 1,000 2,000 3,000 crust lithosphere asthenosphere s0- 200 100 solid liquid 400 150 200 geotherm solidus 600 liquidus click to view larger image it does not change its physical state because its temperature has not changed. it stays at the same depth within the earth. it heats up. it begins to melt as a result of decompression.