The Rocks That Make Up the Oceanic Crust Are All

question 28

Multiple Choice

The rocks that make up the oceanic crust are all:

• A) basalts and gabbros.
• B) andesites and diorites.
• C) aphanitic (rhyolites, andesites, and basalts) because they were cooled rapidly by ocean water.
• D) rhyolites and granites.

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Definitions:

Continental Rift

A linear zone where the Earth's crust and lithosphere are being pulled apart and is characterized by seismic activity and volcanic eruptions.

Eastern Africa

A region of Africa that includes countries along the eastern coast of the continent, known for its diverse cultures, languages, and ecosystems.

Continental Rifting

The process by which a continent stretches and splits along a rift, often leading to the formation of new ocean basins.

Seafloor Spreading

A geological process in which new oceanic crust is formed at mid-ocean ridges and spreads outward, contributing to continental drift.