Match each word to its correct meaning. 1.asthenosphere
the central portion of the earth, having a radius of about 2100 mi. (3379 km) and believed to be composed mainly of iron and nickel in a molten state
2.convection
a layer in the interior of earth or another planet; the Earth's the mantle is sandwiched between the crust in the top and the core in the bottom
3.convergent plate boundary
a tectonic boundary where two plates are moving toward each other
4.core
the transfer of heat by the circulation or movement of the heated parts of a liquid or gas
5.divergent plate boundary
place where plates slide against each other
6.earthquakes
a theory of global tectonics in which the lithosphere is divided into a number of crustal plates, each of which moves on the plastic asthenosphere more or less independently to collide with, slide under, or move past adjacent plates
7.lithosphere
a tectonic boundary where two plates are moving away from each other and new crust is forming from magma that rises to the earth's surface between the two plates
8.plates
series of vibrations produced in the earth's crust by the abrupt rupture and rebound of rocks in which elastic strain has been slowly accumulating
9.transform plate boundary
a vent in the earth's crust through which lava, steam, ashes, etc., are expelled, either continuously or at irregular intervals
10.volcano
the region below the lithosphere, variously estimated as being from fifty to several hundred miles (eighty-five to several hundred kilometers) thick, in which the rock is less rigid than that above and below, but rigid enough to transmit transverse seismic waves