Earth Science With Mr. Thomas. Formation: Through compacting and cementing of layers of sediment. Clastic Rocks: Formed from fragments of other rock.

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Presentation transcript:

Earth Science With Mr. Thomas

Formation: Through compacting and cementing of layers of sediment. Clastic Rocks: Formed from fragments of other rock. Chemical Rocks: Formed from precipitates or fall-out from solutons (Salts).

Organic Rocks: Form from sediments consisting of the remains of plants & animals.

 Features:  Stratification – Layers of materials (clay, sandstone, shale, etc.) that are stacked on top of each other.  Fossils – The remains, impression, or any other evidence of a plant or animal preserved in rock.  Ripple Marks – Sand patterns formed from the action of wind, streams, waves or currents.  Mud Cracks – Left when wet clay deposits dry and contract.

Metamorphism – The process by which a rock’s structure is changed by extreme heat & pressure.  Earth’s Internal Heat  Weight of Overlying Rock  Mountain Building

Results in: 1) Distorted, flattened, and/or stretched crystals. (See pg. 133) 2) Foliation – The tendency of a rock to form bands of minerals or split along parallel layers. (See pg. 135)

 Regional vs. Local  Regional: Affects a large area, usually associated with mountain building and other plate tectonic activity.  Local: Affects a relatively small area, usually associated with igneous intrusions.