| A | B |
|---|
| Axis Of Rotation | An imaginary line through an object, around which the object spins,  |
| Comets | An object that enters the inner solar system, typically in a very elongated orbit around the sun.,  |
| Divergent Boundary | A plate boundary where new crust is being created as the old crust on each side moves away as if on a conveyor belt.,  |
| Fault | is a fracture or zone of fractures between two blocks of rock. Faults allow the blocks to move relative to each other. This movement may occur rapidly, in the form of an earthquake - or may occur slowly, in the form of creep,  |
| Global Warming | An increase in the average temperature of the earth's atmosphere (especially a sustained increase that causes climatic changes),  |
| La Nina | A cooling of the surface water of the eastern and central Pacific Ocean, occurring somewhat less frequently than El Niño events but causing similar, generally opposite disruptions to global weather patterns.,  |
| Mercury | The planet nearest the sun. It has a diameter of 3,032 miles (4,879 kilometers), about two-fifths of Earth's diameter. Mercury orbits the sun at an average distance of about 36 million miles (58 million kilometers), compared with about 93 million miles (150 million kilometers) for Earth.,  |
| Nuclear Energy | The potential energy stored in the nucleus of an atom.,  |
| Plateau | Surface made up of horizontally layered rocks, found at a relatively high elevation.,  |
| Regional | of or pertaining to a region of considerable extent; not merely local,  |
| Sedna | A planetoid of rock and ice about three-quarters the size of Pluto discovered in 2003; the most distant object known to orbit around the sun.,  |
| Solstice | Moment or date when the sun is in its apparent annual movement along the ecliptic reaches its maximum distance north or south of the celestial equator,  |
| Thunderstorm | A brief intense rainstorm that affects a small area and is accompanied by thunder and lightning.,  |
| Uplifting | To cause (a portion of the earth's surface) to rise above adjacent areas,  |
| Weathering | Is the breaking down of Earth's rocks, soils and minerals through direct contact with the planet's atmosphere,  |
