Topic 12b

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A long narrow steep sided depression or slope in the earth's oceanic crust. Usually lying above a subduction zone.

Land has been raised to a new relative position. Reason why fossils are found hundreds or thousands of feet above sea level.

Concept that Sedimentary layers and lava flows are deposited as horizontal, flat sheets when undisturbed

Giving off of gases, lava, and/or lava rock onto Earth's surface or into the atmosphere through the opening or vent of the volcano.

When two plates collide by sliding past each other.

Sections of the Earth's crust that move due to convection currents.

Mountains that are presently rising because they are at the location of converging plates or at the site of a hot spot.

A mountain composed of extrusive igneous rocks or a weak spot in the crust where magma has come to the surface.