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THE ROCK CYCLELets Rock!
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3 Types of Rocks
There are 3 different types of rocks;
Igneous
Sedimentary
Metamorphic
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Igneous Rock
Igneous rocks are formed by magma and lava as it cools.
Igneous rocks form in two different ways.
Rock that comes from lava cools very fast and can either be very light and airy or the rocks can be glassy.
Rocks that come from magma are formed under ground. They are often times very hard and have more colors.
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Igneous rock
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Sedimentary Rock
Sedimentary rock is made when sediments (sand, gravel, and dirt) are pressed together over time and become a rock
Sedimentary rock is formed in layers.
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Sedimentary Rocks
Limestone
Shale
Sandstone
Granite
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Metamorphic Rock
Metamorphic rocks are made from other rocks. (heat and pressure)
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The Rock Cycle
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PARTS OF ROCKS
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Rocks have many different parts
Crystals
Grains
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Crystals
Crystals are different atoms that are formed in a pattern. They can be big or small, fat or thin.
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Grains
Grains are smaller pieces of rock or sediment. Grain size is something that is used a lot to help decide the rock type.
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Rock Explorers
Lets look at some rocks!
Come and pick up a rock (you will be looking at one rock at a time)
You and your group will take turns looking at the rock. Decide if you think that crystals are large or small. Look to see if it has grains.