3 Types Of Rocks
Published on Dec 28, 2015
No Description
MORE DECKS TO EXPLORE
PRESENTATION OUTLINE
THE 3 TYPES OF ROCKS
Photo by Anna & Michal
ROCKS AND HOW THEY ARE CLASSIFIED
- Rock - a combination of one or more minerals or organic matter
- Composition - the minerals and organic matter a rock contains determine the composition or makeup of that rock
- Texture - the size, shape, and positions of the grains that make up a rock determines the rocks texture
Photo by Steve Snodgrass
THE 2 TYPES OF IGNEOUS ROCKS
- INTRUSIVE ROCKS - they form when magma does not reach Earths surface, it cools in large chambers, in cracks, or between layers in the surrounding rock.
- Examples of Intrusive: Granite and Diorite
- EXTRUSIVE ROCKS - they form when lava erupts, or extrudes, onto Earths surface
- Examples of Extrusive: Basalt and Andesite
THE 3 TYPES OF SEDIMENTARY ROCKS
- CLASTIC ROCKS - they form when sediments are buried, compacted, and cemented together by Quartz or calcite
- Examples of Clastic: Mudstone and Siltstone
- CHEMICAL ROCKS - they form when water, usually seawater, evaporates
- Example of Chemical: Halite
- ORGANIC ROCKS - they form from the remains or fossils, of once-living plants and animals
- Examples of Organic: coquina and coal
METAMORPHIC ROCKS
THEY FORM BY AS A ROCK IS EXPOSED TO A HIGH TEMPERATURE IN PRESSURE
Photo by Albert Freeman
THE 2 TYPES OF METAMORPHIC ROCKS
- FOLIATED ROCKS - they form by the metamorphic process in which mineral grains are arranged in planes or brands
- Examples of Foliated: slate and gneiss
- NONFOLIATED ROCKS - they form by metamorphic rocks that do not have mineral grains that are aligned in planes or bands
- Examples of Nonfoliated: quartzite and marble
