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Rocks and formation

QuestionAnswer
Name a rock which has interlocking grains, and what properties do rocks with interlocking grains have? Granite. Hard and less porous.
Which rock has rounded grains? Sandstone
What is a metamorphic rock? Rocks that are changed because of heat or pressure.
How are metamorphic rocks created? The movement of tectonic plates move rocks lower. Rocks are then heated, and put under pressure. This changes the minerals of the rocks.
Give 2 examples of metamorphic rocks, and what they were before. Marble is from limestone. Slate is from shale.
What are sedimentary rocks? Sedimentary rocks are the broken pieces of rocks that get joined together.
What are the 5 stages of how sedimentary rocks are formed? Transport-deposition-sedimentation-compactation-cementation
What is sedimentation? Layers of rock pieces.
How does compaction work? Water is squeezed out from the rock pieces.
How does cementation work? Different salt crystals form. This sticks everything together.
Name 4 sedimentary rocks. Chalk, limestone, shale, sandstone.
How are igneous rocks formed? They are formed from molten rock (magma) that has cooled and solidified.
What are extrusive igneous rocks? When the magma erupts and cools above ground. They cool quickly.
What are intrusive igneous rocks? They form underground from magma. They are cooled slowly.
What is the difference between magma and lava? Lava is above ground, magma is beneath the ground.
If magma cools slowly it makes.... crystals Large
If magma cools quickly it makes... crystals Small
Give an example of extrusive and intrusive rocks. Extrusive-obsidian and basalt Intrusive- granite and gabbro
Created by: 7bhu