BIOMES

dominated by grass and have a warm, dry climate. There are two types of grasslands: tropical grasslands (sometimes called savannas) and temperate grasslands.

dominated by trees, and cover about one-third of the Earth.The three major forest biomes are temperate forests, tropical forests, and boreal forests (also known as the taiga).

dry areas where rainfall is less than 50 centimeters. Deserts can be either cold or hot.

extremely inhospitable conditions. There are two types of tundra: arctic and alpine. 

freshwater and marine biomes. Marine biomes include the ocean, coral reefs, and estuaries.