How are Rocks classified. Chapter 7 Lesson 2 Pages 274-281. Igneous Rock p. 274. Igneous rock is rock that is formed when melted rock hardens. Magma is melted rock inside the Earth. Lava is melted rock at the Earth’s surface. Crystallization is the hardening of magma into rock.
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Chapter 7 Lesson 2
Clastic and Chemical