2.16 What type of rock is oceanic crust?
See if you can answer this question by completing the activity below.
Activity 2.3 Oceanic crust
Allow about 2 minutes
Is oceanic crust igneous, metamorphic or sedimentary?
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.
OpenLearn - An Introduction to Geology
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