| A | B |
|---|
| seismic waves | vibrations that travel through Earth |
| crust | the part of Earth that includes the surface. Composed mostly of rock |
| mantle | layer of Earth under the crust. Composed of oxygen,iron, magnesium and silicon. Some rock is molten |
| outer core | layer of Earth directly around the core. Consists of molten iron and nickel |
| inner core | the center of the Earth. Solid iron |
| tectonic plates | huge fragments formed from Earth's crust and upper mantle |
| convection currents | heat deep in Earth's mantle that moves the tectonic plates |
| continental drift | the theory that tectonic plates in Earth's mantle are moving, causing continents to move |
| Pangea | The name given in 1915 by a scientist to the single supercontinent which in theory, broke up to form the continents |
| geology | the study of the composition and structure of Earth |
| meteorology | the study of the atmosphere |
| oceanography | the study of Earth's oceans |
| paleontology | the study of prehistoric animal and plant life through analysis of fossil remains |
| geochemistry | the study of chemical elements in the Earth's crust, mantle and core |
| ecology | the study of organisms in relationship to their surroundings |
| environmental science | the study of how humans interact with heir environment, both living and nonliving. |
