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Rocks Worksheet Answers
Questions 1. What is the difference between rocks and minerals? Rocks are made of different minerals. Minerals are the ingredients for rocks.
2. How many types of rocks make up the Earth’s crust? Three
3. What are the names of the 3 types of rocks? Igneous, Metamorphic, & Sedimentary
4. How are igneous rocks formed? As molten rock cools and hardens the minerals crystallize and form igneous rocks.
5. What is another name for igneous rocks? Rocks of fire
6. What is the difference between the two types of igneous rocks? Extrusive igneous rock forms when molten rock comes to the surface (lava) and cools quickly to produce fine-‐grained rocks.
Intrusive igneous rock forms when molten rock solidifies underground and cools slowly to produce coarse-‐grained rocks.
7. How are sedimentary rocks made? When sediment or bits of rock plus materials such as shells and sand get packed together.
8. How are metamorphic rocks made? Deep in the Earth by heat and pressure caused by processes such as mountain building.
9. What does the word “metamorphosis” mean? To change
10. Which two layers of the Earth are made of rock? Crust = solid rock Mantle = molten rock/magma
11. What are the names of the other two layers of the Earth, and what are they made of?
Inner and Outer Core, both are made of iron. 12. Write the following layers of the earth in order from most dense to least dense: atmosphere,
crust, inner core, mantle, outer core, water. Inner Core, Outer Core, Mantle, Crust, Water, Atmosphere