1) Harmful materials that are released into the land, water, or air a) Pollution b) Litter c) Release 2) Trash that people leave out in an open place a) Release b) Model c) Litter 3) a type of trash that can make living things very sick a) Litter b) Hazardous Waste c) Pollution 4) Something that can hurt or cause damage a) Harmful b) Litter c) Layer 5) to set free or let go of something a) Hazardous waste b) Release c) Model 6) Which is an example of litter? a) b) c) 7) Which is an example of hazardous waste? a) b) c) 8) Which is an example of pollution? a) b) c) 9) Anything that help us to do a job a) tools b) release c) model 10) a material with characteristics that can be observed or measured a) litter b) Model c) Substances 11) a diagram used by scientists to explain an idea, event, or process a) Model b) release c) substaces 12) Which picture shows clean water? a) b) 13) Which picture shows dirty water? a) b)

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