Rock Cycle Classifying Rocks Igneous Metamorphic Sedimentary
Sedimentary Rock Sediment is weathered, eroded, deposited, compacted, and cemented to make sedimentary rock. Examples: – Sandstone – Conglomerate – Limestone – shale
Igneous Rock Rock material is melted an cooled. Magma underground is made of melted rock. If the magma cools slowly underground, its crystals will be large. Example: granite If the magma erupts from a volcano, the molten rock is called lava. Lava cools quickly, so crystals will be very small. Examples: pumice, scoria, obsidian
Metamorphic Rock This type of rock was once another type of rock that was changed due to extreme heat and pressure, but not melting. Magma underground that is near the rock heats it up, but does not melt it. The rock recrystallizes. Examples: – Limestone becomes marble – Granite becomes gneiss – Shale becomes slate – Sandstone becomes quartzite.