Oh Rocks, rocks, how do I love you? Let me count the ways. Igneous, Sedimentary, and Metamorphic...
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Transcript of Oh Rocks, rocks, how do I love you? Let me count the ways. Igneous, Sedimentary, and Metamorphic...
Oh Rocks, rocks, how do I love you? Let me count the
ways.
Igneous, Sedimentary, and Metamorphic Rocks.
The Rock Cycle
The sequence of the rock cycle depends on the processes that change rocks Weathering Erosion Deposition Pressure Heat
Processes of the Rock Cycle
Weathering The breaking down of
rock by wind, ice, and heat
Erosion The process of
sediment moving from place to place by wind, water, ice, or gravity
Deposition When sediment
moved by erosion comes to rest
Heat and Pressure When sedimentary
rock is squeezed by layers of sediment, heat and pressure may transform sedimentary rock to metamorphic rock
Igneous Rock
Form from cooling magma
Type of igneous rock depends on: What’s in the magma? Time to cool
The longer the cooling time, the more crystals will grow
Igneous Rock: Intrusive or Extrusive
Intrusive Formed below Earth’s
surface Coarse-grained Likely many crystals
Extrusive Formed from eruptions Very small or no
crystals
Sedimentary Rocks: Formation
Weathering Rocks become
fragments Erosion
Rock/mineral fragments moved from one place to another
Deposition Layer-making
Sedimentary Rocks: What’s in them?
Clastic Fragments of rock
cemented together by quartz, calcite, etc.
Chemical Solutions of dissolved
minerals and water Organic
Made from fossilized plant/animal remains
Metamorphic Rock
Literally means “changed shape”
Rock changed by high temperature and pressure into new rock
Mostly happens deep beneath the Earth
How the Shape Change Takes Place Contact
Metamorphism When magma moves
near, or touches, existing rock and changes it.
Regional Metamorphism When pressure deep
below the Earth from tectonic plate movements deforms existing rock
The Rock Cycle:Summary The processes of the rock cycle create
three types of rocks Igneous (made from cooled magma)
Sedimentary (layers of weathered and eroded sediment compacted together)
Metamorphic (rock changed by extreme heat and pressure)