Rocks Definitely Rock!
Igneous, Sedimentary, Metamorphic
By: Olivia Fredrick
Sedimentary rocks are formed by particles of sand, shells, pebbles. Those are all called sediment. Gradually over long periods of time hardens into rock. Sedimentary rock is soft and can easily break into small pieces. It is usually the only type of rock that contains fossil fuels.
Igneous rocks are formed when magma cools and hardens. When lava cools quickly no crystals form and the rock looks shiny. Sometimes gas bubbles are trapped in the rock during the cooling leaving holes in the rock.
Metamorphic rocks are formed under the surface.The rocks that come from these have ribbon like layers and may have shiny crystals formed by minerals over time.
In this video a class will be singing a song about rocks.