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Unit 2 Rocks & Minerals

Unit 2 Rocks & Minerals. 1. Igneous Rocks. There are many kinds of rock in Earth’s crust. These rocks are made up of different minerals. Rocks can be grouped by the way they form throughout the rock cycle. Igneous rocks form from melted, liquid rock. Vocabulary Igneous rocks

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Unit 2 Rocks & Minerals

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  1. Unit 2 Rocks & Minerals

  2. 1. Igneous Rocks

  3. There are many kinds of rock in Earth’s crust These rocks are made up of different minerals

  4. Rocks can be grouped by the way they form throughout the rock cycle

  5. Igneousrocks form from melted, liquid rock Vocabulary Igneous rocks Rock formed when hard liquid rock cools and hardens

  6. This process may take place inside Earth or on Earth’s surface

  7. Inside Earth, magma cools so slowly that it may take a thousand years for a rock to form

  8. One of the most common kinds of igneous rocks is granite Granite is made by magma cooling inside Earth

  9. Granite is light colored with large crystals It is made up mostly of the minerals quartz and feldspar

  10. Granite is strong and does not break easily, even under pressure It is often used in buildings and bridges

  11. Basalt is made when lava pours onto the ground or onto the ocean floor Because the lava cools quickly, the crystals in basalt are small

  12. When lava erupts underwater it makes pillow-shaped lumps, called pillow lava

  13. Sometimes, lava cools so quickly that crystals never have a chance to form Pumice and obsidian are igneous rocks that do not have crystals

  14. Pumice is full of bubbles and is so light that it floats

  15. Obsidian is a glassy, black rock

  16. Video: How to Make Rock Candy

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