11. What does convection in the mantle do to the Earth's internal heat? It
A. increases the temperature of the core
B. transfers heat from the crust to the core C. distributes heat from the core closer to the surface
D. decreases the temperature of the crust and mantle
12. Where does the Earth's primordial heat come from? It is the remaining heat from Earth was still developing into a planet.
A. meteors that hit the surface
B. underwater volcanoes that erupted in the past
C. trapped radiation because of a very thick atmosphere
D. the collision of particles and the redistribution of materials
13. Why does partial melting of rocks happen? It happens because most rocks are made up of
A. several minerals, each with a different melting point
B. one type of mineral making it easy to melt the whole rock
C. one very strong mineral making it difficult to melt the whole rock D. several hard minerals so different chemicals are used for melting rocks
14. Which statement about melting in subduction zones is FALSE?
A. Flux decreases the melting temperature of hot rocks.
B. Rising hot materials transfer heat to surrounding rocks.
C. The subducted tectonic plate melts because of compression.
D. The movement of the subducted plate causes volatiles to mix with hot and dry mantle rock.
15. Why does decompression melting occur in hotspots?
A. Rocks near hotspots are very dense that they melt.
B. Hotspots have very high temperatures that melt surrounding rocks.
C. Rising hot materials from the mantle experience a decrease in pressure.
D. Sinking hot materials from the mantle undergo an increase in pressure. when the​