Rising mantle material will ultimately stop because, at lower pressures, decompression causes the material to expand, cool and contract.

Question

Quizplus · Accepted Answer

Rising mantle material stops because it eventually reaches a similar density to the surrounding material or erupts at the surface, not because it cools and contracts due to decompression. Decompression actually leads to melting, not cooling.

Rising Mantle Material Will Ultimately Stop Because, at Lower Pressures