Earthquakes and Volcanoes

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Geologist
a scientist who examines rocks to find out about Earth's history and structure
Theory of Continental Drift
theory that Earth's continents were once joined together as one "supercontinent" and , over time, a force pulled them apart and they slowly moved to the position they are in today.
Fault
a break or crack in the rocks of the Earth's crust where an earthquake might take place.
Earthquake
caused by plates moving along a fault and results in the sudden shaking of Earth's crust.
volcano
an opening in the Earth's crust.
seismic wave
a vibration that travels through Earth and is produced by an earthquake.
Topographical map
shows the elevation of an area using contour lines.
plate tectonics
the theory stating that Earth's crust is broken into plates the move. It explains how forces deep within the Earth can cause ocean floors to spread and continents to move.
divergent boundaries
a location where plates move apart.
active volcano
a volcano that is currently erupting or has recently erupted.
dormant volcano
a volcano that has not erupted for some time, but scientists think may erupt in the future.
extinct volcano
a volcano that will likely not erupt again.
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