5.2 Faults, Folds & Fossils Unit 5: Earth’s History January 29, 2012

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Presentation transcript:

5.2 Faults, Folds & Fossils Unit 5: Earth’s History January 29, 2012 Sanders

Extrusion An extrusion occurs when molten rock flows onto Earth's surface. The molten material “burns” the surface is moves across. September 2, 2019 Unit 5: Earth’s History

Intrusion Intrusion is when magma squeezes into layers of pre-existing rock. September 2, 2019 Unit 5: Earth’s History

An intrusion can be identified by the thin areas of metamorphism rock that surround it. September 2, 2019 Unit 5: Earth’s History

Folds Folds are bends in rock layers made by movements of Earth's crust, related to Earths tectonic plates. September 2, 2019 Unit 5: Earth’s History

Recall that strata are deposited flat through water. Through tectonic activity, strata become folded. September 2, 2019 Unit 5: Earth’s History

Faults Faults are breaks in the rock where movement has occurred, associated with earthquakes. September 2, 2019 Unit 5: Earth’s History

Folds and faults occur after the rock has formed. September 2, 2019 Unit 5: Earth’s History

Fossils Fossils are the preserved remains or traces of living things. September 2, 2019 Unit 5: Earth’s History

Fossils can give geologists clues about past geological events or relative age of rock layers. September 2, 2019 Unit 5: Earth’s History

Unconformity Unconformity is a gap in the geologic record caused by erosion. It is usually defined as wavy lines. September 2, 2019 Unit 5: Earth’s History