GLOSSARY
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threatened - in danger of harm

toxic - poison

transportation - to carry from place to place: Buses and subways are forms of public transportation.

tree canopy - the tallest trees that provide the leafy covering of the forest

troposphere - the lowest layer of the atmosphere that is 0 - 6 miles above the earth's surface: The troposphere is where we live.

tsunamis - a giant sea wave
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