24 terms

Earth Structure

earth structure
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Terms in this set (...)

Tectonic plates
pieces of Earth's lithosphere
lithosphere
the solid part of the earth consisting of the crust and outer mantle
Igneous Rock
produced by fire, great heat, or the action of a volcano; solidified from a molten state. Igneous rock is formed by the cooling and solidification of magma.
Sedimentary Rock
A type of rock that forms when particles from other rocks or the remains of plants and animals are pressed and cemented together
Metamorphic Rock
Rock changed in structure by heat, moisture, and pressure.
Outer Core
the liquid layer of the Earth's core that lies beneath the Mantle and surrounds the inner Core
Inner Core
a dense sphere of solid iron and nickel at the center of Earth
Plate Boundary
Where two tectonic plates meet
Seafloor Spreading
The process that creates new sea floor as plates move away from each other at the mid-ocean ridges
Ring Of Fire
a major belt of volcanoes that rims the Pacific Ocean
Convergent Boundary
A tectonic plate boundary where two plates meet and move towards each other
Divergent Boundary
the boundary between two tectonic plates that are moving away from each other
Transform Boundary
boundary between two plates that are sliding past each other (causing earthquakes)
Subduction
the oceanic plate is pushed under the continental plate
Oceanic plate
thin tectonic plates under the oceans
Continental plate
thicker tectonic plates that form land masses
Earthquakes
occur when there is a sudden movement between two tectonic plates
Magma
molten rock below the crust which cools to form igneous rock
lava
liquid rock flowing on the surface of the crust
convection currents
the convection currents in the mantle drag the tectonic plates
radioactive processes
in the core create heat and cause convection currents in the mantle
jigsaw theory
the matching shapes of Africa and South America giving evidence for the theory of tectonic plates,
fossil evidence
fossil history in the 'jigsaw' coastlines of Africa and South America matches
aesthenosphere
plastic like upper part of the mantle on which the plates move
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