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Pangaea is:

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:

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  1. Pangaea is: Large, ancient landmass that was composed of all the continents joined together

  2. 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

  3. 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

  4. 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

  5. Convection current is: Currents in Earth’s mantle that transfers heat in Earth’s interior and is the driving force for plate tectonics

  6. Subsidence is: Motion of the Earth’s surface as it shifts downward relative to a datum such as sea=level

  7. Boundary: Indicates a border

  8. Convergent boundary is: Formed when two sections of Earth’s crust is colliding – coming together

  9. DivergentBoundary is: Forms where lithospheric plates are moving away from each other.

  10. Transform Boundary is: Boundary between two lithospheric plates that are sliding past each other.

  11. Rift is: Long crack that forms between tectonic plates moving apart at plate boundaries

  12. Fault is: Fracture that occurs when rocks change their shape by breaking can form as a result of compression, being pulled apart by shear

  13. Subduction zone is: Area in which one lithospheric plate slides under another, occurs at converging plate boundaries

  14. Ridge is: A chain of mountains or hills that form as continuous elevated crest for some distance

  15. Trench is: Depression in the ground, generally defined by being deeper than they are wide.

  16. Asthenosphere is: Plastic-like layer of the Earth on which the lithospheric plates float and move around

  17. Lithosphere is: Rigid layer of Earth about 100 km thick, plates moving apart at plate boundaries

  18. Relief map is: A physical map showing vertical features with a drawing such as shaded mountains

  19. Topography is: Features of a land area caused by differences in elevation.

  20. 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

  21. Contour lines are: On a map, lines that connect point of equal elevation above sea level.

  22. Elevation is: Height above average sea level

  23. Intervals is: Distance between contour lines on a topographic map

  24. 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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