catalyst - A substance that speeds up a chemical reaction., chemical change - A type of change in which a new substance is formed. For example: burning something., physical change - A type of change in which a new substance is NOT formed. For example: water boiling., carbon dioxide - A gas without any color or smell that is commonly found in soda. It is also called CO2 and comes out the back of a car or bus that is running., energy - It makes things happen! (Or more formally: the ability to do work), generator - Changes energy from one form to another., evaporation - When a liquid turns into a gas., condensation - When a gas turns into a liquid., water vapor - Water in gas form., precipitation - Water that falls to the ground. Comes in 3 main forms: rain, snow, and hail., circulatory system - Pumps blood throughout the body providing it with oxygen and removing waste., digestive system - Made up of the stomach, intestines, and other components. It allows us to break down food and absorb its nutrients., nutrients - Provide living things with energy and building blocks to grow.,

miscellaneous science vocabulary

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