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4th Grade Science Review Puzzle

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Across
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The smallest particles that make up soil
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A living thing such as a b plant that can make its own food
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Layer in soil
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A force that resists motion between touching objects
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Type of rock that forms from melted rock
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A simple machine that is a post with an inclined plane wrapped around it
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A group of animals without a backbone
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The path of one object in space around another object
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The group of animals that have a backbone
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Living parts of an ecosystem
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A large, moving mass of ice
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Where a magnet's force is the strongest
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A statement of what you think will happen in an experiment
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The largest particles that make up soil
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Variety in a species
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A mixture in which two or more substances are mixed completely
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Animal that eats only other animals
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The remains or traces of a plant or animal that lived long ago
Down
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Imaginary line on which the Earth rotates
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An animal that eats both plants and other animals
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A group of food chains that overlap
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Smallest unit of an element with all its properties
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The process of sediment moving from one place to another
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A substance made of only one kind of atom
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Nonliving parts of an ecosystem
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A simple machine made of a bar that pivots on a fixed point
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A pull or push of any kind
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Major changes in the body formed during the life cycle of an animal, such as a caterpillar
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A ball of rock, ice and frozen gases in space
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The amount of matter in an object compared to the space it takes up
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The state of matter without a definite shape or volume
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Materials that let electricity move through them easily
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A community and its physical environment together
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The fixed point on a lever
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The solid rock that forms the Earth's surface
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An environment that meets all the needs of an organism
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The measure of an objects change in position over a unit of time
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The amount of matter in an object