Are igneous rocks intrusive or extrusive?
All rocks can be classified as either igneous, sedimentary, or metamorphic. Igneous rocks are formed when magma or lava cools and solidifies into stone.
Answer and Explanation:
Igneous rocks can be either intrusive or extrusive. In fact, these are terms specifically used to describe types of igneous rocks. Intrusive igneous...
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from Earth Science 101: Earth ScienceChapter 7 / Lesson 2