Yr9 Plate tectonics
Earth Science ESL
Terms in this set (23)
German meteorologist who developed the idea of continental drift
The Hypothesis that all continents were once joined into a super continent that split apart over millions of years. Continents continue to move around on the earth
Ancient land mass that broke apart to form continents as we find them today; means "all earth"
Evidence of continental drift
1. Similar fossils found in rocks on different continents
2. Similar rock structures found on different continents
3. Continents fit together like puzzles
4. Climate evidence in glaciers moving in the same directions
Hess's theory based on continental drift that new seafloor is formed when magma is forced upward toward the surface at a mid-ocean ridge
Sea floor spreading mountain ridge under water in the middle of the Atlantic Ocean; looks like the outline of the continents
ocean floor age
evidence for sea-floor spreading that proves that new rock forms close to the Mid-Atlantic Ridge and old rocks sink, melt, and reform at ocean basins
A gently sloping, shallow area of the ocean floor that extends outward from the edge of a continent.
A theory stating that the earth's surface is broken into plates that move.
earth's outermost layer of rock made up of both dry land and ocean floor; made up of 13 main plates
divergent boundary (di=apart; verg=bend or curve)
A boundary along which two tectonic plates move apart, located at a mid-ocean ridge; creates new crust
convergent boundary (con=together; verg=bend or curve)
A tectonic plate boundary where two plates collide; 3 types--ocean-ocean boundary, ocean-continent boundary, continent-continent boundary
A plate boundary where two plates move past each other in opposite directions; no crust created or destroyed
underwater convergent boundary between plates; one piece of crust slides under the other and forms a trench
convergent boundary where ocean crust moves under continent crust and forms a trench; forms volcanic mountains along coast of continent
convergent boundary where both plates are land; forms mountains
any of the world's main continuous expanses of land (Africa, Antarctica, Asia, Australia, Europe, North America, South America).
the layer of the earth between the crust and the core
"iron nickle"; the inner center of the earth
Molten rock beneath the earth's surface
subduction zone (sub=below; duct=take or lead)
Boundary where crust is pushed down into the mantle below another plate.
A violent motion that is caused by energy being released as rocks move along a fault.
A weak spot in the crust where magma comes to the surface.
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