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An introduction to geology
An introduction to geology

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2.16 What type of rock is oceanic crust?

See if you can answer this question by completing the activity below.

Activity _unit2.17.1 Activity 2.3 Oceanic crust

Timing: Allow about 2 minutes

a. 

igneous


b. 

sedimentary


c. 

metamorphic


The correct answer is a.

Discussion

The answer is igneous. It’s all made in volcanoes at the spreading centres, and cools from a molten state (the definition of igneous). The sea floor does get covered in sediment over time which is sedimentary, but the oceanic crust that it forms on is always igneous.