An earthquake that occurs after a larger earthquake in the same area.
The hypothesis that continents moved slowly to their current locations.
Cycle of heating, rising, cooling, sinking that makes plates move.
Area where two plates move towards each other.
Area where two plates move away from each other.
The shaking that results from the movement of rock beneath Earth's surface.
The point on Earth's surface directly above an earthquake's focus.
A break in the Earth's crust where slabs of rock slip past each other.
solid, dense, mostly iron and some nickel
ocean crust, continental crust, rigid upper mantle
layer of molten rock that makes up most of the interior of the Earth
liquid, mostly iron
Single large land mass made up of all continents connected that broke apart 200 million years ago.
Theory that crust and upper mantle move on around on the upper mantle.
Sections of Earth's lithosphere that is composed of the crust and upper mantle.
A scale that rates the seismic waves as measured by a particular type of mechanical seismograph.
A machine used to record earthquake events.
A scientist that studies earthquakes.
Area where two plates are moving past each other.
Large waves that are formed when water is displaced by earthquakes.