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Rocks
- 1. Rocks
- 3. The crust of the earth is made of rock.
- 4. Boulders are big rocks...
- 5. Pebbles are smaller rocks.
- 6. Dirt is mostly very small pieces of rock!
- 7. Igneous There are 3 kinds of rock. Metamorphic Sedimentary
- 8. Igneous rocks are "formed by fire."
- 9. It is made when melted rock cools and hardens.
- 10. When magma cools, it forms intrusive igneous rock
- 11. Intrusive igneous rock cools slowly and usually has large grains. . gabbro granite
- 12. When lava cools, extrusive igneous rock is formed.
- 13. Extrusive igneous rock cools quickly and usually has small grains. basalt pumice
- 14. Some extrusive igneous rocks cool so fast, they have no grains at all! obsidian (volcanic glass)
- 15. Sedimentary rock is formed from layers of sediment.
- 16. Rivers can carry sediment that piles up under water.
- 17. The layers pile up and eventually become hardened into rock
- 18. Sedimentary rocks often look like glued together rocks, pebbles, or sand. sandstone conglomerate
- 19. Some sedimentary rock forms when water evaporates and minerals are left behind.
- 20. Halite (salt) and gypsum are formed this way.
- 21. Fossils are often found in sedimentary rocks.
- 22. Plants & animals are caught in the layers of sediment and leave an imprint in the rock.
- 23. Fossils tell us a lot about things that lived long ago.
- 24. Metamorphic rock is rock that has been changed by heat and pressure. .
- 26. Heat & pressure can change sandstone into quartzite.
- 27. Granite can become gneiss,
- 28. … and shale can become schist!
- 29. But rocks don’t always stay the same. Any kind of rock can change into another kind of rock. Igneous Metamorphic Sedimentary
- 30. Any rock that weathers into sediment can be pressed and cemented. It becomes sedimentary rock.
- 31. Any rock that is melted, can cool off and become igneous rock.
- 32. With enough pressure and lots of heat, any rock can change and become metamorphic rock.
- 33. This pattern of changing rock is called the…
- 34. This changing is called the rock cycle Rock Cycle
- 35. REVIEW 1. Rocks are made of minerals. 2. There are 3 kinds of rocks. 3. Rocks made from cooled lava or magma are igneous.
- 36. 4. Sedimentary rocks are made of layers of sediments that have been cemented together. 5. Metamorphic rocks have been changed with heat and pressure. 6. All rocks can change in the rock cycle.
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