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23 Terms
1
Subduction
________ is the process by which the ocean floor sinks beneath a deep- ocean trench and back into the mantle;
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2
mantle convection
The lithosphere gets shoved into the asthenosphere, the lithosphere gets melted, and becomes part of the ________ cycle.
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3
Sea floor spreading
________ was discovered by Harry Hess in the 1960s.
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4
Sonar
________- a device that bounces sound waves off underwater objects and then records the echoes of these sound waves.
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5
Mid ocean ridges
________ are the longest chain of mountains in the world-- these are divergent plate boundaries.
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6
Mariana Trench
The ________ is an example of a subduction zone.
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7
Sea floor spreading
________ is the process that continually adds new material to the ocean floor while pushing older rocks away from the ridge.
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8
Sonar
a device that bounces sound waves off underwater objects and then records the echoes of these sound waves
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9
Mid ocean ridges are the longest chain of mountains in the world
- these are divergent plate boundaries
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10
Crust
The thin, solid, outermost layer of Earth; Is either continental (landmasses) or oceanic (ocean floors)
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11
Divergent Boundary
The boundary between two tectonic plates moving away from each other; if on land, it creates rift valleys; if on the sea floor, it creates new ocean crust and mountainous ridges.
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12
Magma
Melted or molten rock material beneath Earth's surface; cools slowly to form rocks with larger crystals
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13
Mid-Ocean Ridge
An underwater mountain system formed by plate tectonics; the largest single volcanic feature on Earth.
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14
Seafloor Spreading
The formation of new areas of oceanic crust, which occurs through the upwelling of magma at mid-ocean ridges.
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15
Subduction
The process in which a denser plate is pushed downward beneath a less dense plate when plates converge (come together)
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16
Tectonic Plates
Huge pieces of crust that slowly move on the upper part of the mantle by convection.
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17
Trenches
Deep and narrow depressions in the seafloor; Form where the sub-ducted plate moves into the mantle.
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18
Convergent Boundary
Occurs when two tectonic plates move toward each other and collide.
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19
Ocean Basin
A depression of Earth's surface in which an ocean lies
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