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7th Grade Vocab
| Term | Definition |
|---|---|
| wavelength | The distance between two corresponding parts of a wave. |
| seismic wave | A wave produced by an earthquake. |
| water wave | A wave on the surface of a body of water. |
| sound wave | A disturbance that travels through a medium as a longitudinal wave. |
| energy | The ability to do work. |
| vibration | A repeated back-and-forth or up-and -down motion. |
| matter | Anything that has mass and occupies space. |
| waves | A disturbance that transfers energy from place to place. |
| energy transfer | The process of changing one form of energy into another. |
| nuclear reactions | A reaction involving the particles in the nucleus of an atom that can change one element into another. |
| atom | The smallest part of an element that has all the properties of an element. |
| chemical change | A change in which one or more substances combine or break apart to form new substances. |
| chemical property | A characteristic of a pure substance that describes its ability to change into a different substance. |
| chemical reaction | The process in which substances undergo chemical changes that result in the formation of new substances. |
| closed system | A system in which no matter is allowed to enter or leave. |
| molecule | A neutral particle made of two or more atoms joined by covalent bonds. |
| products | A substance formed as a result of a chemical reaction. |
| density | The amount of mass of a substance in a given volume. |
| boiling point | The temperature at which a liquid boils and turns to vapor. |
| conductivity | The degree to which a material conducts heat or electricity. |
| pH scale | A range of values from 0-14 that expresses the concentration of hydrogen ions in solution. |
| elements | A substance that can not be broken down into any other substance. |
| periodic table of the elements | A system used worldwide for organizing elements into categories. |
| physical change | A change that alters the form or appearance of a material but not its identity. |
| compound | A substance composed of two or more elements chemically combined in a specific ratio. |
| cell | The building blocks of life. |
| cell cycle | The regular sequence of growth and division that cells undergo. |
| specialized cell | In many-celled organisms cells are different from each other. |
| tissues | A group of similar cells that work together to perform a specific function. |
| organs | A group of different tissues that function together. |
| organ systems | A group of organs that work together to perform a major function. |
| photosynthesis | The process by which plants and some other organisms capture the energy in sunlight and use it to make food. |
| sexual reproduction | A biological process that creates a new organism by combining the genetic material of two parent organisms. |
| asexual reproduction | A mode of reproduction in which offspring arise from a single organism with the exact same genes. |
| unicellular organism | Also known as a single-celled organism, a this organism consists of only one cell. |
| multicellular organism | Organisms that consist of more than one cell. |
| carbon dioxide | An important greenhouse gas and burning of carbon-based fuels since the industrial revolution has rapidly increased its concentration in the atmosphere, leading to global warming. |
| carbohydrate | An energy-rich organic compound, such as sugar or starch, that is made up of the elements carbon, hydrogen, and oxygen. |
| protien | Large organic molecules made up of smaller molecules called amino acids. |
| lipids | Energy rich organic molecules such as fats, oils, and waxes. |
| water cycle | The movement of water between the atmosphere and Earth's surface. |
| atmosphere | The layer of gases that surround the planet. |
| evaporation | The change in matter from a liquid to a gas. |
| water vapor | Water in the form of a gas. |
| condensation | The change in matter from a gas to a liquid. |
| clouds | When water vapor in the air condenses around dust particles to form liquid water or ice crystals. |
| convection | The transfer of heat by the movement of a fluid. |
| ocean currents | Streams of water in the ocean that move in regular patterns. |
| wind | The horizontal movement of air from an area of high pressure to an area of low pressure. |
| weather | The conditions of Earth's atmosphere at a particular time and place. |
| climate | The average, year-after-year conditions of temperature, precipitation, winds, and clouds in an area. |
| frontal boundaries | The places where air masses meet and do not mix easily. |
| cold front | A fast-moving cold air mass overtakes a warm air mass. |
| warm front | A warm air mass overtakes a slow-moving cold air mass. |
| stationary front | Cold and warm air masses meet, but neither can move the other. |
| occluded front | A warm air mass is caught between two cooler air masses. |
| air mass | A huge body of air that has similar temperature, humidity, and pressure. |
| jet stream | Bands of high-speed winds about 10 km above Earth's surface. |
| transpiration | Evaporation of water from plants. |
| precipitation | Any form of water that falls from clouds and reaches Earth's surface. |
| infiltraction | The process by which water on the ground surface enters the soil. |
| surface runoff | Runoff is precipitation that did not get (infiltrated) absorbed into the soil, or did not evaporate, and therefore made its way from the ground surface into places that water collect. |
| groundwater | The water located beneath Earth's surface in soil pore spaces and in the fractures of rock formations. |
| absorption | When plants take in water through their roots. |
| watershed | A ridge of high land dividing two areas that are drained by different river systems. |
| elevation | The height above a given level, especially sea level. |
| surface mining | A broad category of mining in which soil and rock overlying the mineral deposit (the overburden) are removed. |
| deforestation | Deforestation is the clearing of trees, transforming a forest into cleared land. |
| overpopulation | This means that there are too many organisms of a certain species in a certain habitat. |
| dams | A large wall or barrier that obstructs or stops the flow of water, forming a reservoir or a lake. |
| landfill | A landfill is a place where waste is kept. |
| air pressure | The result of the weight of a column of air pushing down on an area. |
| barometer | An instrument that is used to measure air pressure. |
| acid rain | Rain that has more acid than normal. |
| fog | A cloud that forms near the ground. |
| dew point | The temperature at which condensation begins. |
| radiation | The direct transfer of energy by electromagnetic waves. |
| conduction | The direct transfer of heat from one substance to another substance that it is touching. |
| energy | Something that can do work. It cannot be created or destroyed. |
| pollution | Harmful substances in the air, water, or soil. |
| reactant | A substance that takes part in and undergoes change during a reaction. |
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