The Three Different Types of Rocks: Igneous Metamorphic Sedimentary

Where Do Rocks Come From? Where do you see rocks? Mountains Canyons Riverbeds All rocks are all made of minerals. As a matter of fact, rocks are made up of 2 or more minerals.

The Rock Cycle The rock cycle is an ongoing process that never stops There are three different types of rocks: Igneous, Metamorphic, and Sedimentary With melting, heat/pressure, and weathering/erosion rocks change into different types of rocks Rocks are always changing

The Rock Cycle (Cont.)

Igneous Rocks The word Igneous comes from the Latin word Ignis, which means Fire. Igneous Rocks come from the magma inside of a volcano There are two types of igneous rocks: Extrusive Intrusive

Igneous Rocks (Cont.) Extrusive igneous rocks are formed when a volcano erupts The magma will spill all over the surface and cool, this is an extrusive igneous rock An intrusive igneous rock is formed when magma doesn’t reach the surface Instead, it forces its way into cracks and spaces between other rocks already inside the Earth and turns solid before ever reaching the surface Magma that never makes it to the surface turns solid slowly, because it takes it a long time to cool inside the hot Earth

Types of Igneous Rocks Some examples of igneous rocks are obsidian, pumice, scoria, and granite.

Metamorphic Rocks Metamorphism means “to change” Normally when we think of metamorphism, we think of caterpillars changing into butterflies Through heat and pressure an igneous rock turns into a metamorphic rock

Metamorphic Rocks (Cont.) Marble is a type of metamorphic rock It is formed limestone, which is an igneous rock The Taj Mahal in India was built of all marble

Types of Metamorphic Rocks Some other examples of metamorphic rocks are schist and gneiss.

Sedimentary Rocks Sedimentary rocks can be formed from many different ways Sedimentary rocks are worn down by wind and rain and are washed downstream where they settle at the bottom of rivers, lakes and oceans. Eventually, with the pressure of everything above the sediments a sedimentary rock is formed! Some of the ways that sedimentary rocks come from are: –Layers of other rocks –Dead animals/plants –Sand

Types of Sedimentary Rocks Some types of sedimentary rocks are gypsum, conglomerate, shale, sandstone, and limestone.

Summary The three different rocks are: igneous, sedimentary, and metamorphic There are two types of igneous rocks: intrusive and extrusive Igneous rocks come from the magma inside of volcanoes Metamorphic rocks “change” with heat and pressure Sedimentary rocks are formed from layers of other rocks (at the bottom of lakes/rivers/oceans), dead animals/plants, or sand.

Works Cited geonet.ca/images/glossary/magma.jpghttp://earthnet- geonet.ca/images/glossary/magma.jpg orphic/metarxs.htmhttp://geology.csupomona.edu/alert/metam orphic/metarxs.htm x/SimpModl.htmlhttp://csmres.jmu.edu/geollab/fichter/SedR x/SimpModl.html