Cracking Crustal Questions
Convergent
• Also called convergent boundary
• The motion of two plates toward one another
• Requires that the subducting plate move beneath the other, overriding plate.
Crust
• The exterior portion of the earth that lies above the mantle
Continental Crust
• the layer of granitic, sedimentary and metamorphic rocks
• Form the continents and
• Shores, known as continental shelves.
• “Floats" on top of the liquid mantle
Oceanic Crust
• A thick mass of igneous rock which lies under the ocean floor.
Divergent Plate
• 2 plates moving away from each other
• Splits the plate
Fault
• A fracture in the continuity of a rock formation
• Caused by a shifting or dislodging of the earth's crust,
• Adjacent surfaces are displaced relative to one another and parallel to the plane of fracture.
• Also called shift.
Mountain
• Created collisions between continental masses.
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Subduction
• Zone or area
• Ocean crust collides with continental crust
• Ocean crust goes UNDERNEATH continental crust
Transform plate or boundary
• Two plates slide or grind against one another
Trench
• Marks where subduction has occurred
• A very deep pocket in the ocean
Volcano
• An opening in the earth's crust through which molten lava, ash, and gases are ejected.
• A mountain• Most volcanoes are found on the boundaries of
the enormous plates that make up the Earth's surface.
• Some of the most violent eruptions take place along convergent boundaries where one plate margin is forced beneath another.