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Pangaea is: . Large, ancient landmass that was composed of all the continents joined together. Theory of PlateTectonics is: . Theory that the Earth’s crust and upper mantle are broken into plates that float and move around on a plastic-like layer of the mantle. Continental Drift is: .

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Pangaea is:

Large, ancient landmass that was composed of all the continents joined together


Theory of PlateTectonicsis:

Theory that the Earth’s crust and upper mantle are broken into plates that float and move around on a plastic-like layer of the mantle


Continental Drift is:

Wegener’s hypothesis that all continents were once connected in a single , large land mass that broke apart about 200

million years ago

and drifted

slowly to their

current positions


Sea Floor Spreading is:

Hess’s theory that new seafloor is formed when magma is forced upwards toward the surface at the mid-oceanic ridge


Convection current is:

Currents in Earth’s mantle that transfers heat in Earth’s interior and is the driving force for plate tectonics


Subsidence is:

Motion of the Earth’s surface as it shifts downward relative to a datum such as sea=level


Boundary:

Indicates a border


Convergent boundary is:

Formed when two sections of Earth’s crust is colliding – coming together


DivergentBoundary is:

Forms where lithospheric plates are moving away from each other.


Transform Boundary is:

Boundary between two lithospheric plates that are sliding past each other.


Rift is:

Long crack that forms between tectonic plates

moving apart at

plate boundaries


Fault is:

Fracture that occurs when rocks change their shape by breaking can form as a result of

compression, being

pulled apart by

shear


Subduction zone is:

Area in which one lithospheric plate slides under another, occurs at converging plate boundaries


Ridge is:

A chain of mountains or hills that form as continuous elevated crest for some distance


Trench is:

Depression in the ground, generally defined by being deeper than they are wide.


Asthenosphere is:

Plastic-like layer of the Earth on which the lithospheric plates float and move around


Lithosphere is:

Rigid layer of Earth about 100 km thick, plates moving apart at plate boundaries


Relief map is:

A physical map showing vertical features with a drawing such as shaded mountains


Topography is:

Features of a land area caused by differences in elevation.


Topographic Map is:

A map that shows the shape and elevation of the

land surface using

contour lines, and

shows other land

features using

symbols and colors


Contour lines are:

On a map, lines that connect point of equal elevation above sea level.


Elevation is:

Height above average sea level


Intervals is:

Distance between contour lines on a topographic map


Benchmark is:

A permanently affixed mark that establishes the exact elevation of a place; used by surveyors in measuring site elevations


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