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Stack #123867
| Question | Answer |
|---|---|
| inner core | a solid sphere of metal, mainly nickel and iron, at the Earth's center |
| outer core | a layer of molten metal, mainly nickel and iron, that surrounds Earth's inner core |
| mantle | the layer of Earth between Earth’s outer core and crust; Earth's thickest layer |
| crust | the thin layer of rock above Earth’s mantle |
| lithosphere | the layer of Earth made up of the crust and the rigid tock of the upper mantle |
| asthenosphere | the layer in Earth’s upper mantle directly under the lithosphere |
| tectonic plate | one of the large, moving pieces into which Earth's lithosphere is broken and which commonly carry both oceanic and continental crust |
| continental drift | the hypothesis that Earth’s continents move on Earth's surface |
| Pangaea | a hypothetical supercontinent that once included all of the landmasses on Earth; proposed by Wegener |
| convection current | a circulation pattern in which material is heated and rises in one area, then cools and sinks in another area |
| divergent boundary | a boundary along which two tectonic plates move apart |
| convergent boundary | a boundary along which two tectonic plates scrape past each other |
| transform boundary | a boundary along which two tectonic plates scrape past each other |
| magnetic reversal | a switch in the direction of Earth’s magnetic field so that the magnetic north pole becomes the magnetic south pole |
| hot spot | an area where a column of hot material rises from deep within a planet's mantle |
| subduction | the process by which an oceanic tectonic plate sinks under another plate |
| mid-ocean ridge | underwater moutain ranges |
| theory of plate tectonics | Earth's lithosphere is made up of huge plates that move over the surface of the Earth |
| rift valley | the gap formed by mid-ocean ridges |
| convection | energy transfer by the movement of material |
| continental-continental collision | when two continental crust plates push together causing crumbling and folding of the two plates |
| oceanic-oceanic subduction | two plates with oceanic crust collide forcing one plate to sink |
| oceanic-continental subduction | when a plate with oceanic crust sinks below a continental crust plate |
| fossil | trace or remains of an organism |
| original remains | actual parts or bodies of an organism |
| ice core | tubular sample that shows layers of snow and ice built up over thousands of years |
Created by:
Science Geek
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