| A | B |
|---|
| Mohorovicic Discontinuity | The boundary between Earth's crust and mantle. It is also known as the "Moho." |
| asthenosphere | The lower part of the upper mantle that exhibits plastic (flowing) properties on which the continents move. |
| basalt | The commonest type of solidified lava; a dense dark gray fine-grained igneous rock. |
| continental crust | A rocky material that makes up the thickest part of earth's crust not located under the ocean. |
| convection currents | The transfer of thermal energy inside the Earth and is the driving force for plate tectonics. |
| crust | The outermost, rocky layer of the Earth |
| inner core | The innermost layer of the earth made of solid iron and nickel. |
| lithosphere | The outermost layer of Earth's surface which is rocky and solid and includes the rigid part of the upper mantle. |
| mantle | The thickest layer of Earth, under the crust, in which plate movement is generated. |
| oceanic crust | The thin part of the Earth's crust located under the oceans. |
| outer core | The layer inside Earth between the mantle and inner core which is made up mostly of molten iron and nickel. |
| sial | The first layer of the continental crust which is made of granite like igneous rock. |
| sima | The second layer of the continental crust made up of basalt rock. |
