Chapter 4 Lesson 3 The Crust

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Presentation transcript:

Chapter 4 Lesson 3 The Crust Earth Science Unit 1 Chapter 4 Lesson 3 The Crust

The Crust The thin, hard outer layer of the Earth It complex and varied because of the activity of the action of the mantle underneath The Earth’s thinnest layer The depth varies based on individual rocks beneath it

Kinds of Crust Continental crust- The crust on which the continents rest Has a more complex structure than the oceanic crust

Regions of The Continental Crust 1. Shields Made of crystalline rocks Ancient formations Platforms – eroded shields that create vast planes Examples: high plateaus in Africa and Asia

Regions of The Continental Crust 2. Mobile belts- folded rocks forming new mountians Examples- Alps, Himalayas, Andes

Regions of The Continental Crust 3. Sedimentary basins- broad, deep depressions filled with sedimentary rocks Form in shallow seas

Oceanic Crust The crust beneath the oceans Basalt is the primary rock in this area Thinner and denser than the continental crust Consists of three layers

Top Layer Made of mud, sand, or other sediments Can be up to 1 km thick

Second Layer Can be 1 km thick Made mostly of basalt

Third Layer About 5 km thick Made of gabbro