Hard as a ROCK
By: Grace Taylor
Sedimentary, Igneous, Metamorphic
Sedimentary, Metamorphic, and igneous are all differet types of rocks. They all are formed in many different ways.
- Sedimentary rocks are formed by layers of dirt and soil getting pressed together with no heat. Over long periods of time all of the dirt is cemented together in to a rough shape. An example of a sedimentary rock is limestone. limestone is used in many different ways you can find lime stone in, building material, filling for tooth paste and paint and bases on roads. If you look at a sedimentary rock you will find broken shells and rocks. In some sedimentary rocks you can see the different layers some times they are different colors.
- Metamorphic rocks are like butterflies. Metamorphic rocks are formed when igneous and sedimentary rocks are exposed to very high pressure or temperature or large amounts of very hot water. When the two rocks are touching and there is very high tempurture or pressure the slowly melt together to form a metamorphic rock. A metamorphic rock has ribbon like layers and may have crystals in it. The metamorphic rock feels smooth. An example of a metamorphic rock ion marble. You can find marble on countertops in a kitchen.
- Igneous rocks are formed when magma cools and hardens.Magma is the orange liquid that comes out of a volcano. Magma is extremely hot. Another word for magma is lava. When lava cools really quickly, no crystals form and the rock looks shiny and glasslike. Sometimes gas bubbles are trapped in the rock durring the cooling process, leaving tiny holes and spaces in the rock. An example of an igneous rock is granite. You can find granite on countertops. An igneous rock feels very smooth.