4th Grade Science Crossword Puzzle

QUESTIONS LIST: biotic : living parts of an ecosystem, solution : a mixture in which two or more substances are mixed completely, sand : the largest particles that make up soil, force : a pull or push of any kind, atom : smallest unit of an element with all its properties, glacier : a large, moving mass of ice, axis : imaginary line on which the earth rotates, erosion : the process of sediment moving from one place to another, producer : a living thing such as a b plant that can make its own food, element : a substance made of only one kind of atom, igneous : type of rock that forms from melted rock, food web : a group of food chains that overlap, friction : a force that resists motion between touching objects, omnivore : an animal that eats both plants and other animals, lever : a simple machine made of a bar that pivots on a fixed point, orbit : the path of one object in space around another object, vertebrate : the group of animals that have a backbone, screw : a simple machine that is a post with an inclined plane wrapped around it, clay : the smallest particles that make up soil, diversity : variety in a species, magnetic pole : where a magnet's force is, carnivore : animal that eats only other animals, the strongest, horizon : layer in soil