Give reasons for the following:
Igneous rocks are also called primary rocks.
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Igneous rocks are also called primary rocks because they are formed when molten lava solidifies. Sedimentary rocks and metamorphic rocks are formed from other rocks.
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Distinguish between Volcanic rocks and plutonic rocks.
Distinguish between Thermal and Dynamic Metamorphism.
Extrusive igneous rocks have generally small crystals.
Rocks are of great economic significance.