An igneous rock that cooled slowly underground will have crystals that are as compared to an igneous rock that cooled quickly at earth's surface.

Large

Explanation:

An igneous rock that cooled slowly underground are called intrusive igneous rocks and their slow cooling allows LARGE crystals to form. Examples include diorite, gabbro, granite, pegmatite, and peridotite. While extrusive igneous rocks cools quickly at Earth's surface after eruption to form small crystals.

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