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Earth’s History

Earth’s History. Earth’s Crustal Plates. The earth's crust is divided into several plates, similar to an eggshell. These plates are constantly moving and when they collide they can form a mountain, rift or trench! These are examples of slow changes in the earth's surface. .

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Earth’s History

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  1. Earth’s History

  2. Earth’s Crustal Plates The earth's crust is divided into several plates, similar to an eggshell. These plates are constantly moving and when they collide they can form a mountain, rift or trench! These are examples of slow changes in the earth's surface.

  3. Earth’s Crustal Plates cont. When Earth’s crust pulls apart rapidly, they can make magma flow up from the earth causing a volcanic eruption. When rock breaks along a fault, it can cause an earthquake. The rocks release seismic waves that can shake the earth around you.

  4. EARTHQUAKE!

  5. VOLCANIC ERUPTION!

  6. Pangaea Most scientists agree that earths “continents” were once a one big cotenant known as Pangaea. Do to the movement of tectonic plates the earth is what it is today. Fossils were even found across the globe that suggest they came from far away. Scientists also do believe that in about 250 million years from now Pangaea will reform but backwards…

  7. Pangaea will return! Pangaea future Pangaea past Earth Now

  8. Deposition of sediments Deposition is when small rocks are blown and carried by water or air. When they land in a spot in which they will not move they begin to build up. Examples of sediments are rocks, sand, mud, ice, snow, ect.

  9. Rock Formation There are three types of rock formations. Sedimentary, Metamorphic and igneous are all types of rock formations. The little pieces of earth that are blown away by deposition, These layers are called sedimentary rock. Metamorphic rock is rock that was “morphed” from another kind of rock, meaning that it was once a sedimentary or igneous rock. It was changed by heat and pressure deep in the earths crust. Igneous rock are also known as fire rocks because they are formed deep in the ground in magma pockets.

  10. Erosion • Erosion is where bits of the earth are worn away by water, wind or ice. NO ROCK IS HARD ENOUGH TO RESIST THE FORCES OF WEATHERING AND EROSION. Erosion moves bits of rock around different places in a location, similar to if you throw dust in the air on a windy day, the air takes it somewhere else.

  11. Weathering • Weathering is the dissolving or breaking down of rocks on earths surface. Water, ice, acids, salt, plants, animals, and temperature all play a key role in weathering. Often, water creeps into cracks of a rock and weakens the internal structure, eventually causing it to collapse.

  12. Questions • Will Pangaea ever reform, if so how? • What are the three types of rock and how are each of them formed? • Explain what happens when a slow tectonic plate moves away from another tectonic plate? • What are some natural forces that cause weathering? • Give an example of how an animal could cause weathering? • How do we know that Pangaea was once the only continent? (at least one example)

  13. Sources http://adventuresingeology.com/2010/12/08/andnow-to-your-local-earthquake-forecast/ http://www.thegeminigeek.com/what-is-volcanic-eruption/ http://science.nasa.gov/science-news/science-at-nasa/2000/ast06oct_1/ http://eatrio.net/pangea-maps http://www.geolsoc.org.uk/ks3/gsl/education/resources/rockcycle/page3463.html http://www.nationsonline.org/oneworld/earth.htm http://www.fi.edu/fellows/fellow1/oct98/create/metamorph.htm http://education.nationalgeographic.com/education/encyclopedia/erosion/?ar_a=1 http://education.nationalgeographic.com/education/encyclopedia/weathering/?ar_a=1

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