| A | B |
|---|
| plate | A large section of the earth's surface made of the crust and the rigid part of the mantle. |
| weathering | The process that breaks down and changes rocks |
| erosion | The moving of weathered rocks and soil. |
| igneous rock | Rock formed from melted rock that comes from deep within the earth. |
| deposition | The dropping of materials moved by erosion. |
| metamorphic rock | Rock formed when igneous or sedimentary rock is changed by heat or pressure. |
| sedimentary rock | Rock formed when sediments are pressed or cemented together. |
| rock cycle | The ways that rocks change from one form to another. |
| mantle | The middle layer of the earth, between the crust and the core. |
| core | The center part of the earth, beneath the mantle. |
| mineral | Material that forms in the earth from nonliving matter. |
| hydrosphere | The water part of the earth's surface. |
| sequencing | Putting things in the correct order. |
| lithosphere | The rigid outer shell of the earth. |
| crust | The top layer of the earth, above the mantle. |
| plate tectonics | The theory stating that the earth's surface is broken into plates that move. |
| atmosphere | The layer of gases that surrounds the earth and contains the clouds. |
| renewable resource | A resource that can be replaced within a reasonably short period of time. |
| non-renewable resource | A resources that cannot be replaced after it is used. |
| fossil fuel | A fuel that formed over many years from the remains of living organisms. |
| groundwater | Water from rain or snow that sinks into the earth and is stored there. |
| air pollution | The addition of any unwanted substance into the air. |
| pollutant | An unwanted substance added to the air, land or water. |
| carbon monoxide | A colorless, odorless, poisonnous gas made of carbon and oxygen. |
| ozone | A molocule of oxygen that contains three atoms of oxygen. |
| acid rain | Rain containing acids formed when air pollutants react with water vapor. |
| Celsius | Temperature scale in which water boils at 100 degrees and freezes and O degrees. |
| water vapor | Water in the form of an invisible gas. |
| humidity | The amount of water vapor in the air. |
| evaporate | To change from a liquid to a gas. |
| condense | To change from a gas to a liquid. |
| precipitation | Any form of water that falls to the earth from a cloud. |
| runoff | Water that falls onto land and drains off the surface. |
| climate | The average weather conditions in an area over many years. |
| infrared radiation | Energy with a wavelength longer than the wavelength of light. |
| greenhouse gases | Carbon dioxide, water vapor and other gases in the atmosphere that absorb infrared radiation from the earth's surface. |
| greenhouse effect | The process by which gases in the atmosphere absorb heat and heep the earth warm. |
| global warming | An increase in the earth's temperature. |
| reflection | The bouncing of light off a surface; a way to gather and focus light. |
| refraction | The bending of light as it passes from one material to another; a way to gather and focus light. |
| spectroscope | An instrument that separates light into a pattern of lines of different colors. |
| galaxy | A group of billions of stars, dust, and gases in space held together by gravity. |
| constellation | Stars that appear to be in groups when viewed from Earth. |
| light year | The distance light travels in one year. |
| metorite | A piece of meteoriod that lands on Earth after passing through the atmosphere. |
| comet | A ball of ice, dust, and gases that travels through space and orbits the sun. |
| meteor | A bright streak of light that passes through the Earth's atmosphere. |
| meteroid | A small piece of rock or metal that travels in space around the sun. |
| asteroid | A rocky object that revolves around the sun. |
| model | A representation of how something looks or works. |
| elliptical | Oval shaped like a flattened circle. |
| digit | A symbol used to write numbers. |
| period | A 3-digit group of numbers separated from other groups by a comma. |
