acid rain
Rain that contains chemical pollutants and can harm living and nonliving things.
Acid rain has made the lake's water poisonous and is harming the fish.
amphibian
Animal with smooth, moist skin; it has gills when young and then develops lungs when older.
Frogs, toads, and salamanders are amphibians.
animal
A living thing that can move from place to place, has a body covering, and eats other animals or plants for food.
Monkeys and ocelots are two kinds of animals found in a tropical rain forest.
armor
A type of protective covering for the body.
A hard covering of armor could protect a dinosaur from sharp teeth.
astronomy
The study of space and the heavenly bodies.
Galileo's study of Earth's orbit around the sun is astronomy.
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