Multiple Choice
Most of the basalt and gabbro on the ocean floor is created at mid oceanic ridges, which are also ____.
A) divergent plate boundaries
B) ocean-ocean convergent plate boundaries
C) transform plate boundaries
D) ocean-continent plate boundaries
E) intraplate igneous areas
Correct Answer:
Verified
Correct Answer:
Verified
Q10: On its slow journey through the crust,
Q11: _ is a coarse-grained igneous rock (grains
Q12: Partial melting of the lower continental crust
Q13: Mafic igneous rocks are silica-poor.
Q14: _ are igneous rocks that are silica-deficient
Q16: Lava is magma on the Earth's surface.
Q17: The crust beneath the world's oceans is
Q18: What type of melting takes place when
Q19: Crystal settling accounts for important deposits of
Q20: The geothermal gradient for a volcanic region