New oceanic crust and lithosphere are formed at ________.
A)divergent boundaries by submarine eruptions and intrusions of felsic magma
B)convergent boundaries by submarine eruptions and intrusions of felsic magma
C)divergent boundaries by submarine eruptions and intrusions of mafic magma
D)convergent boundaries by submarine eruptions and intrusions of mafic magma

Question

Quizplus · Accepted Answer

New oceanic crust and lithosphere are formed at divergent boundaries by submarine eruptions and intrusions of mafic magma. Divergent boundaries are areas where the Earth's tectonic plates move away from each other. Mafic magma is low in silica and high in magnesium and iron, which makes it more fluid and easier for it to flow to the surface to form new crust.

New Oceanic Crust and Lithosphere Are Formed at ________