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8 Cards in this Set
- Front
- Back
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describe what a converging , diverging and transform boundaries
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converging - coming together ------> <------ diverging - splitting apart <------ -------> transform - sliding past each other |
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define what a mineral is
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a mineral is a rock made up of one or more pure naturally occurring non-living crystalline materials called minerals a mineral can be an element or a compound there are over 3000 minerals |
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what is crystal shape lustre colour cleavage and fracture streak |
crystal shape - building blocks of minerals 6 basic shapes lustre - how it reflects light ( use words like dull shiny colour - the outer layer colour not very effective cleavage and fracture - the way a mineral breaks apart if a mineral breaks along smooth flat surface = cleavage if the mineral breaks with rough edges = fractures streak - the minerals trues colour |
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describe a igneous rock
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the rocks are formed when lava cools intrusive rock forms magma that cools slowly deep inside the earths crust because the rock cools slowly and the crystals are very large extrusive rock forms when magma reaches the surface cools rapidly because the rock cools quickly the crystals are very small |
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what is a sedimentary rock
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this rock is made up of sediments - loose material such as bits of rock minerals and plants and animal remains they become cemented together in layers stratification most often happens near water these layers settle on upon the other until the bottom layer 75% of the earth's surface is sedimentary rock |
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metamorphic rock
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it changes usually it occurs below the surface with heat or extreme pressures
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what is erosion
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is the movement of rock and mineral grains from one place to another sediments come from larger rocks that have been broken down through weathering
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