Ultramafic lava flows are relatively uncommon.Why is that?
A)They are rarely generated in the mantle.
B)They have a high melting point and the crustal temperature is too low.
C)They are high density and therefore do not rise in the mantle.
D)They have high viscosity like felsic melts.

Question

Quizplus · Accepted Answer

Ultramafic lavas have a high melting point, which makes it difficult for them to exist as liquid magma at the relatively lower temperatures found in the Earth's crust. This is why ultramafic lava flows are uncommon.

Ultramafic Lava Flows Are Relatively Uncommon.Why Is That