The earth's crust in midocean
A) is always solid and thin relative to the continents.
B) is always solid and thick relative to the continents.
C) may have rifts through which molten rock rises and spreads out.
D) may have rifts through which the ocean floors sink downward.

Question

Quizplus · Accepted Answer

The midoceanic ridges are areas where tectonic plates are diverging and new crust is being formed from magma that rises up and solidifies. This process creates rifts in the crust through which molten rock can rise and spread out, forming new crust. Therefore, the crust in midocean may have rifts through which molten rock rises and spreads out. It is not necessarily always thin but can vary in thickness. The ocean floors do not sink downward through these rifts, but rather spread apart due to the movement of the tectonic plates.

The Earth's Crust in Midocean