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Rocks and Rocks and The Rock CycleThe Rock Cycle
• Rock is a solid material made up of one or more minerals or other substances, including the remains of once-living things.
Types of RocksTypes of RocksTypes of RocksTypes of Rocks1)1) Igneous RockIgneous Rock
2)2) Sedimentary RockSedimentary Rock
3)3) Metamorphic RockMetamorphic Rock
Sedimentary RockSedimentary rock forms when particles of rock and
other materials are pressed and stuck together Erosion moves sediment from place to place on
Earth’s surface. Sediment is laid down in a process called
deposition. Slowly thick layers of sediment build up and the
weight of the layers above presses down on the layers below. The process is call compaction, squeezes the layers of sediment together.
Another process, called cementation, glues the sediment together.
Three major types of sedimentary rocks
1. Clastic rocks are pieces of rocks that have been pressed and stuck together.
siltstone
conglomerate
3. Chemical Rock areformed when dissolved minerals come out of solutions and form crystals.
iron ore
rock salt
Metamorphic Rock
Heat and great pressure deep beneath Earth’s surface can change rock to metamorphic rock
Sometimes heat from a volcano causes nearby rock to become metamorphic rock
The Rock CycleThe Rock Cycle Forces inside Earth and the surface Forces inside Earth and the surface
produce a rock cycle that builds, produce a rock cycle that builds, destroys, and changes the rocks in destroys, and changes the rocks in the crust.the crust.
The The rock cyclerock cycle is a series of processes is a series of processes on and beneath Earth’s surface that on and beneath Earth’s surface that slowly change rocks from one kind to slowly change rocks from one kind to another.another.
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