Rocks

Types of Rocks Sedimentary Rocks Metamorphic Rocks Igneous Rocks

Igneous Rocks What are They? Fire Rocks Fire Rocks Formed underground by trapped, cooled magma or above ground when volcanoes erupt and lava cools Formed underground by trapped, cooled magma or above ground when volcanoes erupt and lava cools

Types of Igneous Rocks Granite Scoria Pumice Obsidian

Sedimentary Rocks How They are Made Particles of other rocks or the remains of plants and animals are pressed and cemented together Particles of other rocks or the remains of plants and animals are pressed and cemented together Forms in layers below the surface Forms in layers below the surface

Types of Sedimentary Rocks Gypsum Sandstone Shale Limestone Conglomerate

Metamorphic Rocks What are They? Existing Rocks are changed by pressure, heat, or chemical reactions Existing Rocks are changed by pressure, heat, or chemical reactions They were once igneous or sedimentary They were once igneous or sedimentary

Types of Metamorphic Rocks SchistGneiss

Extrusive rocks- igneous rocks formed from lava (ex: basalt) Intrusive rocks- igneous rocks formed from magma (ex: granite)

Lava/magma that is low in silica forms dark colored rocks. If it is high in silica, it forms light colored rocks.

Rocks from Coral Reefs Coral reefs are structures of calcite skeletons built up by coral animals in warm, shallow ocean water. Coral reefs are structures of calcite skeletons built up by coral animals in warm, shallow ocean water. When coral animals die, their skeletons remain and more corals build on top of them. When coral animals die, their skeletons remain and more corals build on top of them.

The Rock Cycle Forces inside the Earth and at the surface produce a rock cycle that builds, destroys and changes the rocks in the crust Forces inside the Earth and at the surface produce a rock cycle that builds, destroys and changes the rocks in the crust Plate movements drive the rock cycle Plate movements drive the rock cycle