Inside the Earth Ch 4 Vocab
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Created by:
browngdavid on December 6, 2011
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23 terms
Terms | Definitions |
|---|---|
 seismograph | The machine that detects the vibrations (seismic waves) in the earth |
| core | The central part of the Earth below the mantle |
| mantle | The layer of rock between the Earth's crust and core |
| iron | This element from the periodic table makes up the core of the Earth. |
| crust | The thin and solid outermost layer of the Earth above the mantle |
| mesosphere | The strong, lower part of the mantle between the asthenosphere and the outer core |
| lithosphere | The solid, outer layer of the Earth which we walk on that consists of the crust and the rigid upper part of the mantle |
| seismic waves | Vibrations that pulse through the Earth after an earthquake |
| tectonic plate | A moving block of lithosphere that consists of the crust and some mantle |
| asthenosphere | The "plastic" layer of the mantle under the lithosphere on which the tectonic plates move |
| pangaea | The single "super" continent that existed 245 million years ago (The name means "all earth" in Greek) |
| continental drift | The hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present locations |
| Alfred Wegener | Person who looked at the continents and said that they fit together like a puzzle. He proposed the idea of continental drift. |
| magnetic reversal | The magnetic poles change places through the course of history and this is recorded in the rocks |
| sea-floor spreading | An example of a divergent boundary where new oceanic crust forms as magma rises toward the surface and solidifies under the ocean |
| transform boundary | The boundary between tectonic plates that are sliding past each other horizontally |
| convergent boundary | The boundary that is formed by the collision of two lithospheric plates |
| plate tectonics | The theory that explains how large pieces of the Earth's outermost layer, called tectonic plates, move and change shape |
| convection currents | Hot rock from deep within the Earth rises while cooler rock near the surface sinks |
| divergent boundary | The boundary between two tectonic plates that are moving away from each other |
| 5 Layers of the Earth | LAMOI -- Lithosphere, Asthenosphere, Mesosphere, Outer Core, Inner Core |
| 3 Main Structures of the Earth | Crust, Mantle, Core |
| Magnetic Field | This is made by the movement of the iron at the core of the Earth. It protects us from harmful radiation of the Sun. |
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