a long, narrow ditch.
Trench
a large elongated depression with steep walls formed by the downward displacement of a block of the earth's surface between nearly parallel faults or fault systems.
Rift Valley
an elevated region with a central valley on an ocean floor at the boundary between two diverging tectonic plates.
Oceanic ridges
A large amount of mountains in the same place.
Mountain ranges
a linear feature that exists between two tectonic plates that are moving away from each other.
Divergent boundary
a type of fault whose relative motion is predominantly horizontal in either sinistral or dextral direction.
Transform boundary
a current in a fluid that results from convection.
Convection Currents
the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.
Subduction
a major geological fault in California
San Andreas Fault
a very long narrow elevation on the ocean floor that runs all the way from Iceland in the North Atlantic to Bouvet Island in the South Atlantic.
Mid Atlantic Ridge
a place where sections of the crust of the Earth move relative to each other.
Fault
the two sub-layers of the earth's crust (lithosphere) that move, float, and sometimes fracture and whose interaction causes continental drift, earthquakes, volcanoes, mountains, and oceanic trenches.
Tectonic Plates
A rocky mountain or hill filled with magma and/or lava.
Volcano
When the Earth's Ground shakes.
Earthquake
the relatively thick part of the earth's crust that forms the large landmasses.
Continental Crust
he relatively thin part of the earth's crust that underlies the ocean basins.
Oceanic Crust
an area in the basin of the Pacific Ocean where a large number of earthquakes and volcanic eruptions occur.
Ring of fire
an actively deforming region where two tectonic plates or fragments of the lithosphere move toward one another and collide.
Convergent Boundary
The region of the interior of the Earth between the core and the crust
Mantle
Its underlain by the mantle.
Crust

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