World Biomes
According to National Geographic, ther are at least five types of major biomes on earth: aquatic, grassland, forest, desert, and tundra. Each biome has it's own subtypes.
We'll focus on aquatic and forest biomes.
Aquatic
Aquatic biomes consist of bodies of water.
Forest
Forest biomes have many trees.
You can find more information about biomes here: NASA's Earth Observatory.