Plate tectonics vocabulary

1. crust2. mantle3. core4. lithosphere5. asthenosphere6. mesosphere7. tectonic plate8. continental drift9. sea-floor spreading10. plate tectonics

11. convergent boundary12. divergent boundary13. transform boundary14. compression tension15. folding16. fault17. uplift18. subsidence19. rift zone

Inside the Earth….Textbook page 393

The crust textbook page 392

The Physical structure of Earthtextbook pages 394-395

tectonic plates – pieces of the lithosphere that move around on top of the asthenosphere

Textbook page 396

How do we know the Earth’s interior consistency???? Textbook page 398

seismic waves – vibrations caused by earthquakes

Seismologists use readings from seismographs to calculate the density and thickness of each layer of the Earth. Intro. to Earthquakes by Frank Gregario

• continental drift – hypothesis that the continents once formed a single landmass, broke up, and drifted to their present locations.

• Textbook page 401

Textbook page 402

magnetic reversals and sea-floor spreading textbook page 403

sea-floor spreading – process by which new oceanic lithosphere forms as magma rises toward the surface and solidifies

molten rock contains magnetic materials. magnetic materials align with the magnetic field of the Earth.molten rock cools and these materials are set in their direction.Earth’s magnetic field reversesmagnetic materials align with the magnetic field of the Earthmolten rock cools and these materials are set in this new direction.

The Theory of Plate Tectonicstextbook pages 404-405