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Rocks and the Rock Cycle

Published on May 12, 2016

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1.

Rocks and the Rock Cycle

Photo by Nicole Nicky
2.

Rock

a naturally formed solid made of one or more minerals
Photo by cobalt123
3.

igneous rock

rock that was once melted and then cooled and hardened
Photo by James Bowe
4.

sedimentary rock

rock made when materials settle into layers and get squeezed until they harden
Photo by scott1346
5.

metamorphic rock

rock that has been changed by heat or pressure
Photo by subarcticmike
6.

How Igneous Rocks Form

  • melted rock reaches Earth's surface
  • it cools
  • this could happen through a volcano
Photo by gnuckx
7.

How Sedimentary Rock Forms

  • wind and water break rocks into bits
  • wind and water carry away the bits of rock
  • the bits settle into layers
  • after time, they harden
  • many fossils are found in this type of rock
Photo by go2bob
8.

How Metamorphic Rock Forms

  • forms deep int Earth's crust
  • pressure and temperature cause the rocks to change
  • sediments and layers mix
Photo by James St. John
9.

The Rock Cycle

It can take MILLIONS of years to change rocks!
10.

Weathering

wind, water, and ice break down earth's crust
Photo by Luca Zanon
11.

Erosion

carries broken down rock away
Photo by Peter Rivera

Dena Thomas