Ravenous rocks question Flashcards
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Types of grain
- Interlocking:When the grains fit together like a jigsaw puzzles, making them impernable.Made using crystals
- Rounded:When the grains, leave air pockets in the rocks, making them porous.Made using sediments
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Rock types
- Igenous
- Sedimentary
- Metamorphic
Grain type
Igenous
Interlocking grain
How are igenous rocks formed
Via volcanic material crystalising/cooling
Where are igneous rocks formed
Near volcanoes/In the lithiosphere
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Igenous Rock cycle
- Existing rocks are moltenified in lava or magma
- The molten rock mix with other molten rocks(making sedimentary-igneous rock), but some can still stay seperate due to their densisty
- The molten rock eventually rises to the top of the mantle, or erupts above the crust, settling and eventually coolong
- Depending on whether it’s above or below crust, and how fast it cools, the sediments will crystalise (long cooling time=bigger crystals vice versa)
Type of grain
Sedimentary
Rounded
How are sedimentary rocks formed
Via other rocks types, compresssing into new ones
Where are sedimentary rocks formed
Near river or water sources
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Sedimentary Rock cycle
- Existing rocks are weathered away by physical, chemical or biological means
- The rock pieces are transported away from their location by human or physical means.Both of these steps collectivity are known as erosion
- The rocks pieces are eventually depoisited somewhere new
- Over time, more rocks pices settle in the same place, compressing eachother as well as other substances, cementing as well
Type of grain
Metamorphic
Interlocking
How are metamorphic rocks formed
When one or serval rocks is exposed to high pressure and heat over milllions of years, eventualy turning into new rocks
Where are metamorphic rocks formed
Deep in the crust
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Compaction metamorphism (heat+pressure)
- Existing rock is compacted by sediments/other substances.This puts pressure on the below rocks
- As well as this, the weight , causes the rock into the ground closer to the mantle.This aslo put heat on the below rocks.
- Eventually the intense heat and pressure, results in strong metamorphism, making the new rock, partillary resisant to heat and pressure
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Intrusive magma/Extruisive lava metamorphism (heat)
- Sometimes, the mantle comes to the existing rock, either in the form of intrusive magma, or (rarley)extruisive lava.
- This only puts intense heat of the rock, causing weak metamorphism, and making rock only partillarly resisant to heat