The Earth & Rocks Visit www.worldofteaching.comwww.worldofteaching.com For 100’s of free powerpoints.

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Presentation transcript:

The Earth & Rocks Visit For 100’s of free powerpoints

The Earth Crust 10km to 100km thick Mantle Extends almost halfway to centre Solid properties but flows Core Iron & Nickel Just over half the Earth’s radius Liquid outer core Solid inner core The average density of the Earth is much greater than the density of the rocks that form the crust. This means that the interior of the Earth is made from different and denser materials than the crust

The Rock Cycle Sedimentary rocks Layers Ripples Fossils Metamorphic rocks Formed by high pressure & temperature Evidence of mountain building processes Associated with Earth movements Igneous rocks Have been molten Crystals Intrusive – big crystals Extrusive – small crystals

The Crust Sedimentary rocks in layers Younger rocks usually on top of older rocks Young Old Sedimentary rocks are also found: Tilted Folded Fractured Upside down This shows that the Earth’s crust is unstable and has been subjected to very large forces