GCSE Physics unit 1 Revision GCSE Physics unit 1 revision 2.0 / 5 based on 4 ratings ? PhysicsGCSEAll boards Created by: LeahCreated on: 08-01-11 21:22 The Earth The rocky crust averages 10-40km deep. The mantle extends about halfway to its centre. The core is made mostly from iron, solid at the centre and liquid above. 1 of 10 The rock cycle The cycle of changes in rock material, caused by processes such as erosion, sedimentation, compression, and heating. 2 of 10 Radioactive Dating Estimating the age of an object such as a rock by measuring its radioactivity. Activity falls with time, in a way that is well understood. 3 of 10 Continental Drift All the continents used to be all joined together, forming a single giant continent called Pangaea. 4 of 10 Seafloor Spreading There is a chain of mountains on the ocean floor, this is called the ocean ridge. All seafloor moves away from the ocean ridge. Therefore seafloor spreading could move continents. 5 of 10 Tectonic plates The Earth's crust is made up from a dozen giant slabs of rock and many smaller ones. These are called techtonic plates. Convection currents on the Earth's sold mantle carry the plates along. 6 of 10 Making Mountains Collisions between tectonic plates make mountains. This could happen in 3 ways? An ocean plate dives back down to Earth, volcanic peaks form at the surface. Pushing movement at destructive margins also cause rocks to buckle and fold, forming a mountain chain. Or an ocean closes completely, 2 continents collide slowely. The edges of the continents crumple together and pile up, making mountain chains. 7 of 10 Earthquakes These are caused by tectonic plates rubbing together. 8 of 10 Volcanoes These are simply a vent in the Earth's surface that erupts magma. 9 of 10 Big Bang An explosion ofa single mass of material. This is an explanation about the start of the universe. 10 of 10
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