Rainforests are forests that have a high volume of rainfall, normally between 70 and 80 inches per year. Tropical rainforests are treasure troves of life, with an abundance of plants and animals. Because of the tropical climate, plants and animals in a tropical rainforest can thrive and grow all year round.
Rainforests cover only about 6-7% of the Earth's total land area, but they are home to nearly half of its plants and animals. A single square mile of rainforest can be home to over 50,000 species of insects, 375 species of plants, 180 species of trees, and 100 species of birds. The plants in rainforests are responsible for over 28% of the Earth's total oxygen supply.
Most of the time when we talk about rainforests, we are referring to tropical rainforests, but there are also temperate rainforests in many other parts of the world, including the Western United States.