| A | B |
|---|
| basalt | extrusive igneous rock making up the oceanic plates |
| granite | rock that has larger crystals thintrusive igneous rock that makes up the continental plates |
| mantle | a layer of hot molten rock beneath the curst that the plates move on |
| lithosphere | the uppermost part of the mantle and the crust together form this rigid layer |
| outer core | a layer of molten nickel and iron that surrounds the inner core |
| inner core | a dense ball of hot pressurized iron and nickel in the center of earth |
| crust | outer layer of the earth made up of oceanic and continental plates and part of the lithoshpere |
| oceanic crust | made of dense basalt and floats the continental crust |
| continental crust | made of granite and rides on the oceanic crust |
| convection current or cell | circular current from differences in temperatures of the mantle where the hot molten rock rises and the cooler falls |
| causes earthquakes, mountains, and volcanoes | convection currents in the mantle |
| 4 layers of the earth | crust, mantle, outer core, inner core |
| fossil | preserved remains of ancient organisms found only in sedimentary rock |
| sediments | remains of organisms, soil, rock particles, bone, shell that form sedimentary rock |
| plate tectonics | the constant moving of the earth's rock plates due to convection currents in the mantle of earth |
| continental drift | the moving apart of the earth's plates to from different continents |
| pangaea | the super continent made of all earth's land mass |
| volcano | forms where there are openings in the crust |
| earthquakes | occurs at fault lines in the plates |
| mountains | forms from the pushing up of plates as they hit each other |
