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ROCKS

BY MEGAN SANDERSON. ROCKS. SEDIMENTARY ROCKS. HOW ARE SEDIMENTARY ROCKS MADE ?.

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ROCKS

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  1. BY MEGAN SANDERSON ROCKS

  2. SEDIMENTARY ROCKS

  3. HOW ARE SEDIMENTARY ROCKS MADE ? • The rock is pushed into the river, then other rocks bang into it and make bits break off then after a long time layers build up and are forced together .The pressure and time make the bits of sand and earth (layers are made of ) into rocks!

  4. IGNEOUS ROCKS

  5. IGNEOUS ROCKS Underground, they are formed when the melted rock, called magma, deep within the earth becomes trapped in small pockets. As these pockets of magma cool slowly underground, the magma becomes igneous rocks. Igneous rocks are also formed when volcanoes erupt, causing the magma to rise above the earth's surface. When magma appears above the earth, it is called lava. Igneous rocks are formed as the lava cools above ground.

  6. medtamorphic rocks

  7. metamorphic rocks • Metamorphic rocks are rocks that have changed. The word comes from the Greek "meta" and "morph" which means to change form. Metamorphic rocks were originally igneous or sedimentary.

  8. EXAMPLES OF ROCKS

  9. THE STORY OF AN IGNEOUS ROCK There is a volcano then when the volcano erupts the magma (which was under the ground heating up) will come out flying up high in the air then will come rushing down the mountain (volcano) coming really fast. Then the lava (magma) will eventually cool down and turn into solid molten rock. When the magma gets up to the surface and flows out, like what happens when a volcano erupts, then the liquid is called lava. Lava flows down the sides of the volcano. When it cools & turns hard it is called obsidian, lava rock or pumice - depending on what it looks like.

  10. THE STORY OF METAMORPHIC ROCKS Metamorphic rocks are rocks that have changed. The word comes from the Greek "meta" and "morph" which means to change form. Metamorphic rocks were originally igneous or sedimentary, but due to movement of the earth's crust, were changed. If you squeeze your hands together very hard, you will feel heat and pressure. When the earth's crust moves, it causes rocks to get squeezed so hard that the heat causes the rock to change.

  11. the story of a sedimentary rock. The wind and water break down the earth . Then bits of the earth settle in the lakes and rivers . Some layers are formed and they build up. The pressure and time turn the layers of sand and earth into rocks .

  12. WHAT IS WEATERING ? WEATHERING IS THE BREAKING DOWN OF ROCKS DUE TO THE WEATHER. FREEZE THAW WEATHERING… Freeze thaw weathering is made by water. There was a crack in the rock then some Water gets into the crack. overnight the water inside the rock freezes. When the rock freezes the rock expands then when the morning comes again the water melts. This continues to happen until the rock breaks. ONION SKIN WEATHERING… First the rock is heated in the day then the rock expands . At night the rock is cold then the rock gets smaller. This is continually happening to the rock. As this happens the rocks skin starts to peel off like onion skin. This usually happens in desert area s were as at night the moon cools it and at day the sun warms it up.

  13. The other type of weathering The other type of weathering is biological weathering. Biological weathering is were there is a little crack in a rock. A little seed gets blown into the rock. The seed gets moisture, light and shelter. The little seed grows into a plank and the plants roots break the rock into several pieces. Animals also break the rock up by digging and things. Then the rock get broke as well.

  14. THANK YOU FOR WATCHING MY SLIDESHOW BY MEGAN SANDERSON.

  15. Message from Mr Manson • Some really nice work and presentation Megan. You certainly use a lot of pictures in making this story • A good balance between the story and information and the pictures help to soften the information • I thought this was a really good piece of work Megan, well done! • A1

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