ROCKS

abbby
Mind Map by abbby, updated more than 1 year ago
abbby
Created by abbby over 5 years ago
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Rocks and some facts about them. For Year 8
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ROCKS
1 Weathering and erosion
1.1 Weathering is when a physical or chemical process which wears away or breaks rocks into smaller fragments
1.1.1 PHYSICAL WEATHERING: Onion skin weathering. Rock: when its hot will expand then when it cools down it goes back to normal then when it heats up it goes to room temp
1.1.2 PHYSICAL WEATHERING: Freeze thaw. When a cracked rock gets water inside and the water freezes to form ice. The ice expands and then cracks the rock off
1.1.3 CHEMICAL WAETHERING : An example is acid rain it dissolves into the rock and creates holes
1.1.4 BIOLOGICAL WEATHERING: Roots and shoots grow through cracks in rocks causing them to break
2 Metamorphic rocks: these are formed by rocks under heat and pressure, in other words they are previously rocks which have changed into metamorphic rocks
2.1 Igneous rocks: these are rocks that are formed when magma cools down
2.1.1 Sedimentary rocks: these are formed when igneous rocks are weathered and eroded and grains compact and cement them together forming layers
3 Igneous rock: GRANITE
4 METAMORPHIC ROCKS: Marble, Quartize
5 Sedimentary rocks: sand, limestone, chalk and clay

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