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Chapter 13

Across
Small Volcano with steep sides and explosive eruptions made of ash and rock.
Shaking of the earth's crust
Single landmass from which Alfred Wegner thought the continents separated millions of years ago
Bending of rock layers that are squeezed together
Theory that the major landmasses of the earth move.
Theory that the ocean floor spreads apart as new crust is formed at mid ocean ridges
Theory that the earth's surface is made of large sections of crust that move.
Point inside the earth where rock firs moves starting an earthquake
Large section of the earth's crust that moves
Dense center of the earth made of solid and melted metals
Round opening through which magma reaches the surface of the earth
Break in the crust in which the overhanging block of rock has been raised.
Scale used to measure the strength of an earthquake
Layer of the earth that surrounds the core.
Down
Break in the crust in which the overhanging block of rock has slid down.
Large sea wave caused by vibrations of the earth
Break in the crust in which the blocks of rock move horizontally past each other.
Break in the earth's crust along which movement occurs
Instrument that detects and records earthquake waves.
Circular motion of a gas or liquid as it heats.
Mountain that develops where magma pushes up through the earth's surface.
Point on the earth's surface directly over the focus of an earthquake
Outer layer of the earth.