1 / 24

Chapter 4 Lesson 1 Plate Tectonics

Chapter 4 Lesson 1 Plate Tectonics. What Are Earth’s Layers. Core - central part Inner Core – solid metals Outer Core – liquid metals. Mantle – thick layer of solid and molten rock that surrounds the core Lower – solid rock Upper – 2 parts Lithosphere – solid- upper mantle & crust

keane-byers
Download Presentation

Chapter 4 Lesson 1 Plate Tectonics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 4Lesson 1Plate Tectonics

  2. What Are Earth’s Layers

  3. Core- central part Inner Core – solid metals Outer Core – liquid metals Mantle – thick layer of solid and molten rock that surrounds the core Lower – solid rock Upper – 2 parts Lithosphere – solid- upper mantle & crust Asthenosphere – upper mantle – melted rock Earth’s Layers

  4. Crust Thin layer of solid rock that makes up the outermost layer. Where we live Atmosphere – All gases that surround the Earth Hydrosphere All of Earth’s liquid and solid water (lakes, oceans, rivers, glaciers) Covers 70% of the Earth

  5. Landforms – a physical feature of the Earth’s surface

  6. Earth ~200 million years ago

  7. The Continental Drift Hypothesis Geologist – person that studies rocks Thought of by Alfred Wegener in 1915. Continents "drifted" to their present positions. Supercontinent Pangaea started to break up about 200 million years ago.

  8. Continental Drift: Evidence Geographic fit of South America and Africa Fossils match across oceans Rock types and structures match across oceans Ancient glacial features

  9. Continental Drift: Evidence Tight fit of the continents, especially using continental shelves.

  10. Continental Drift: Evidence Fossil critters and plants

  11. Continental Drift: Evidence Correlation of mountains with nearly identical rocks and structures

  12. Continental Drift: Evidence Glacial features of the same age restore to a tight polar distribution.

  13. Presumably, Pangaea was ripped apart by such continental rifting & drifting.

  14. What causes the continents to move? Plate Tectonics • Theory to explain how forces deep within Earth can cause seafloors to spread and continents to move.

  15. Tectonic Plates

  16. Continental Divergent Boundary Example: Red Sea / E. African Rift

  17. Magma – hot melted rock • Tension – push or a stretch on the plates • Seafloor Spreading – caused by magma pushing on the plates

  18. Mid Ocean Ridges - underwater mountain ranges

  19. Subduction – when one tectonic plate can sink under another plate- crust gets recycled back into the mantle

  20. Compression – a squeezing or pushing together of the crust This creates folded mountains. Mountain Formation

  21. Fault Block Mountain Caused by tension when one block of rock moves down Sierra Nevada Mountains Fault – deep cracks in the Earth’s crust where rocks move in the opposite direction

More Related