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7th Grade Core
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USOE

Science Language Students Should

Know and Use.

Atmosphere
The layers of air that surround Earth. The densest atmospheric layers are closer to Earth, and the least dense layers are far away from Earth.
Atom
The smallest particle of a chemical element which has all the properties of that element.
Crust
The solid outermost layer of the Earth.
Density
A comparison of the mass of a substance with its volume. Mathematically, density is calculated as:. A dense object or liquid tends to sink in a less dense liquid.
Diffusion
The process of matter spreading out evenly from its source. An example of diffusion is when perfume is sprayed and eventually is smelled throughout a room.
Gas
The least dense form of matter for a given substance. Particles in a gas are moving rapidly and tend to be quite far apart. Particles move freely and have no definite shape.
Liquid
The form of matter that tends to flow freely. Typically liquids are capable of taking on the shape of the container that they are placed within. Particles are in constant motion but are closer together than the same particles in a gas form.
Model
A larger or smaller representation of an item .
Mass
A measure of the amount of matter in an object. Mass is usually measured in Grams.
Matter
Anything that has mass and takes up space.
Molecule
A substance that occurs when two or more atoms are chemically combined. It is the smallest form of a chemical combination.
Particle
A small piece of something. Typically used to represent a small part of matter.
Solid
The densest form of matter for any substance. Solids generally have a fixed shape. The particles within them vibrate constantly but do not allow the solid to change shape.
Temperature
A measure of the amount of kinetic energy in a particle. Objects with a high amount of motion have a higher temperature than those with a lower amount of motion.
Heat
A transfer of kinetic energy or motion.
Energy
How much motion a particle has.
Volume
The amount of space taken up by a substance. Volume is generally stated as cubic meters, m3, liters, or a variation of one of these.
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Updated October 24, 2008 by: Glen Westbroek

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