1. 5.2 Faults, Folds & Fossils Unit 5: Earth’s History January 29, 2012
Sanders

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

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

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

5. 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

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

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

8. Folds and faults occur after the rock has formed.
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Unit 5: Earth’s History

9. Fossils Fossils are the preserved remains or traces of living things.
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Unit 5: Earth’s History

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

11.  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