GLOSSARY
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abdomen - in humans and other mammals, the middle part of the body containing the stomach, liver, intestines, pancreas and the spleen

acid rain - pollution from cars, factories, and power plants that mixes with water vapor and falls back to earth as rain

altitude - height; the vertical distance

anemometer - an instrument that measures the wind's speed or force

antivenin - a medicine used to counteract the effects of snake bites or poisonous insect bites

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