Plate tectonics vocabulary 1.crust 2.mantle 3.core 4.lithosphere 5.asthenosphere 6.mesosphere 7.tectonic plate 8.continental drift 9.sea-floor spreading 10.plate tectonics 11.convergent boundary 12.divergent boundary 13.transform boundary 14.compression tension 15.folding 16.fault 17.uplift 18.subsidence 19.rift zone

Inside the Earth…. Textbook page 393

The crust textbook page 392

The Physical structure of Earth textbook pages

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 reverses magnetic materials align with the magnetic field of the Earth molten rock cools and these materials are set in this new direction.

The Theory of Plate Tectonics textbook pages