the earth's oldest rocks, formed from lavas and deep magmas. They were once molten but then cooled and crystallized. Most igneous rocks are resistant to erosion. Eg. Basalt and granite
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Metamorphic rocks
Sedimentary rocks that were heated and compressed during igneous activity. Heating and compression harden them and make them resistant.
Shale becomes slate and limestone becomes marble.
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Sedimentary rocks
Formed from sediments eroded and deposited by rivers, the sea, or on the sea bed. Eg. Limestone
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Granite
Igneous
Contains crystals of quartz, feldspar and mica.
Very resistant
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Basalt
Igneous
Almost black and heavy
Very resistant
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Chalk
Sedimentary
Very porous, like a sponge
Medium resistance
Stronger than clay and younger sand
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Carboniferous limestone
Formed from crushed shells and skeletons
Permeable
Generally resistant
Has underground caves and rivers
Sedimentary
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Slate
Formed from baked mud or shale
Metamorphic
Very resistant
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Other cards in this set
Card 2
Front
Sedimentary rocks that were heated and compressed during igneous activity. Heating and compression harden them and make them resistant.
Shale becomes slate and limestone becomes marble.
Back
Metamorphic rocks
Card 3
Front
Formed from sediments eroded and deposited by rivers, the sea, or on the sea bed. Eg. Limestone
Back
Card 4
Front
Igneous
Contains crystals of quartz, feldspar and mica.
Very resistant
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