Inside the Earth Ch 4 Vocab

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seismograph

The machine that detects the vibrations (seismic waves) in the earth that come from earthquakes

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....the layer we walk on

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 of the upper 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 when two tectonic plates slide toward each other...."Come together"

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..."My poooooor dog"

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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