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8th Unit 2 Vocab
8th Grade Discovery Education Unit 2 Vocab
| Term | Definition |
|---|---|
| Celsius | The metric temperature scale: Water boils at 100 degrees Celsius, and it freezes at 0 degrees Celsius. |
| Galaxy | A group of solar systems, dust, and gas held together by gravity; our solar system is part of the Milky Way galaxy |
| Gas | a state of matter without any defined volume or shape in which atoms or molecules move about freely |
| Heat | the transfer of thermal energy |
| Hydrogen | the chemical element consisting of one proton and one electron |
| Light | waves of electromagnetic energy; electromagnetic energy that people can see |
| Light Year | the distance light travels in a vacuum in one year; about 6 trillion miles |
| Magnify | to make something appear larger, usually by using one or more lenses |
| Nebulae | an interstellar cloud made up of hydrogen gas, plasma, helium gas, and dust |
| Optical | having to do with the eye or lenses |
| Star | a massive ball of gas in outer space that gives off heat, light and other forms of radiation |
| Sun | any star around which planets revolve |
| Telescope | an instrument used to observe objects that are far away |
| Universe | everything that exists in, on and around the Earth |
| Air | the part of the atmosphere closest to Earth; the part of the atmosphere that organisms on Earth use for respiration |
| Attract (Magnetism) | the action between two opposing magnetic poles. |
| Core | the innermost layer of Earth, comprised of the liquid outer core and solid inner core; consists mainly of iron and nickel. |
| Earth | the third planet from the Sun; the planet on which we live (related words: earthly; earth - meaning soil or dirt). |
| Electric | having to do with electricity; a form of energy commonly used for lights, electric motors, and heating. |
| Electromagnet | a metal object that acts as a magnet when an electric current moves through it. |
| Equator | an imaginary line that divides Earth into Northern and Southern Hemispheres; located halfway between the North and South Poles (related word: equatorial) |
| Force | a pull or push that is applied to an object |
| Magnet | an object with a north and south pole that produces a magnetic field (related term: magnetism, magnetic) |
| Magnetic Field | a region in space near a magnet or electric current in which magnetic forces can be detected |
| Planet | a large circular mass that revolves around a star |
| Polar | in earth science, having to do with the areas on Earth closest to the geographic North or South poles; in chemistry, describes a molecule that has a positively charged side and a negatively charged side (related words: pole, polarity). |
| Pole | the opposite ends of a battery, a magnet, or the north and south ends of the Earth |
| Repel | to force an object away or to keep it away (related term: repulsion) |
| Sun | any star around which planets revolve |
| Asteroid | a small object made of rock or metal that orbits the sun |
| Axis | an imaginary line that an object spins or revolves around |
| Comet | a body of ice and dust that travels in a long narrow orbit around the sun |
| Diameter | the length of a straight line that runs from one side of a circle (or sphere), through the middle of the circle (or sphere), to the other side; the width of a circle or sphere through its middle. |
| Earth | the third planet from the Sun; the planet on which we live (related words: earthly; earth - meaning soil or dirt) |
| Gravity | a force that exists between any two objects that have mass (related word: gravitational) |
| Kuiper Belt | an area in the solar system beyond the planets where many small, icy bodies are located |
| Latitude | angular distance north and south of the equator |
| Moon | a body in outer space that orbits a planet; a natural satellite |
| Orbit | the circular path of an object as it revolves around another object |
| Position | a specific point in space |
| Revolution | the orbiting of an object around another object |
| Rotate | turning around on an axis; spinning (related word: rotation) |
| Rotation | the spinning of a celestial body, such as a planet, around an axis |
| Space | the large, empty part of the universe that does not contain any matter |
| Star | a massive ball of gas in outer space that gives off heat, light and other forms of radiation |
| Sun | any star around which planets revolve |
| Surface | the top of an object; the outside of an object; the boundary between two objects or materials |
| System | a group of parts that work together to function or perform a task |
| Theory | a set of statements or principles devised to explain a group of facts or phenomena, especially one that has been repeatedly tested or is widely accepted and can be used to make predictions about natural phenomena. |
| Elliptical | shaped like an oval |
| Force | a pull or push that is applied to an object |
| Fusion | a nuclear reaction in which nuclei combine to produce more massive nuclei resulting in the release of large amounts of energy |
| Kinetic Energy | the energy an object has due to its motion |
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