Kinds of Rocks

​Conglomerate: A rock made up of several different materials, such as a rock made up of different kinds of rounded pebbles.

​

Igneous: Formed by great heat or actions of volcanoes.

​

Metamorphic: Description of something that has changed form; a rock that has changed from one form to another.

​

Sedimentary: Rocks formed as the result of eroded rock particles or minerals settling out of water.siltVery fine mineral particles.

​​Sedimentary: a rock that is formed by weathering, erosion, and deposition

​

​Igneous: a rock formed from rapidly cooling magma

​

Metamorphic: a rock that has been changed from one form to another by heat and pressure

• ​Forms in layers

• ​Formed by erosion, weathering, and deposition

• ​​Shale: made of very tiny grains of clay

• ​​​Sandstone: contains larger grains of sand (quartz)

• ​​Conglomerate: large pebbles, cobbles, or boulders (near rivers)

• ​Limestone is formed from a dissolved mineral, calcite (lime).

• Formed by heat and pressure

• ​​Granite is a course-grained light colored rock which usually contains large crystals of quartz, feldspar, and mica.

• ​Basalt is a dark, fine-grained rock which has few or no crystals large enough to see

• ​When heat and pressure cause a rock to change from one form into another.

• ​Both igneous and sedimentary rocks can be changed to metamorphic rock.

• ​Marble: was once limestone.

• ​Slate: was formed from shale.

• ​Quartzite consists of nearly pure quartz