| A | B |
|---|
| Air Mass | a large body of air that is like the land over which it forms |
| Air Pressure | the weight of the air or atmosphere. |
| Atmosphere | the thin layer of air between Earth's surface and outer space |
| Axis | the imaginary line on which the Earth is tlted and rotates |
| Condensation | the change in a substance from a gas to a liquid. Ex.-Clouds forming in the water cycle |
| Conservation | protecting our resources |
| Deposition | depositing sediment(soil) in a new location |
| Diameter | straight line passing through the center of a circle or sphere |
| Dissolve | to mix very evenly and separate into particle too small to be seen |
| Earthquake | a movement and shaking of the Earth caused by shifting of the Earth's plates and the sudden release of energy in the Earth's crust |
| Erosion | the carrying away of rock or soil by wind, water, or ice |
| Evaporation | ehen liquid becomes a gas. Ex.- water is ocean becomes a water vapor in water cycle |
| Fault | a crack in the Earth where earthquakes occur |
| Fossil | the remains of dead plants and animals in sedimentary rock |
| Fossil Fuel | a substance, such as coal, petroleum, or natural gas, formed orver millions of years from the remains of organisms and used today as an energy source |
| Glacier | a large piece of ice that changes the landforms as it moves |
| Gravity | the force that causes attraction between objects that have mass |
| Mercury | the smallest planet and closest planet to the sun |
| Moon | a natural satellite that orbits the Earth |
| Nonrenewable resource | a resource that can be used up |
| Orbit | the path a planet follows around the sun |
| Phases | the different shapes of the moon during the lunar cycle |
| Pollution | the release of harmful substances into the environment |
| Precipitation | any form of water that falls from the clouds to Earth |
| Recycle | to reuse materials |
| Renewable Resource | a resource that can be replaced in a short time |
| Revolution | the trip the Earth makes around the sun once every 365 1/4 days |
| Rotation | the turning of the Earth on its imaginary axis |
| Seasons | times of the year caused by the revolution of the Earth around the sun and the tilt of the Earth on its axis |
| Sediment | silt, or soil good for plant growth because it absorbs water |
| Sedimentary Rock | rock that contains fossils |
| Soil | a resource composed of rock and mineral fragments, humus, air and water |
| Solar Energy | energy that comes from the sun |
| Solar System | the sun, eight planets, and the other objects that orbit the sun |
| Sun | the star closest to Earth that provides energy |
| Sunspots | dark areas on the sun's surface that are cooler that the rest of the sun |
| Tides | the movement of the ocean caused by the gravitational pull of the moon |
| Weathering | the process that breaks down rocks |
| 365 1/4 days | the length of one year on Earth; the time it takes the Earth to orbit the sun one time |
