Watersheds can carry pollution from inland and deposit it into these larger bodies of water. When rivers, streams, and rainfall all flow to a single point where they then empty out into a large body of water, such as a lake or ocean, this is known as a watershed. Known as tributaries when they form large rivers Combined, rivers and streams make up 3% of earth’s freshwater and help drain excess water away from the land. Rivers are larger than streams and eventually flow out into the ocean. The bottom of a river is the riverbed and the sides form its banks. Moving freshwater comes in the form of rivers and streams. Summerkill and Winterkill can be a problem for those raising fish. The decaying algae lowers oxygen levels and kills off some of the plants and animals, known as summerkill. Algae, a plant-like organism found in lakes, can overproduce and die off in large numbers. This causes some plants and animals to die off, known as winterkill. The top layer can freeze, however, and cut down on oxygen levels. Since a lake is so deep, it cannot freeze solid. The temperature of a lake varies widely from top to bottom. Plants survive only near the shoreline because further out the water is too deep for adequate sunlight. Lakes can stretch to thousands of square kilometers in size. When a body of water grows larger and deeper than a pond, it becomes a lake. Due to its shallow depth, a pond may freeze solid in the winter or completely evaporate in the summer. Temperature is consistent throughout and the water is still, with no waves. Plants grow around the pond and often spread across the bottom of the pond since the water is still shallow enough for sunlight to reach its depths. A pond is a shallow hole where water builds up over time from falling rain. The freshwater biome consists of many unmoving bodies of water known as ponds and lakes. The marine biome consists of the oceans, which contain plenty of saltwater. The freshwater biome includes ponds, rivers, streams, and other bodies of water with little salt in them. Water makes up three-fourths of Earth’s surface and creates two of its biomes: the freshwater biome and the marine or saltwater biome. Many experts agree that seven biomes make up our world. A large area that shares the same weather patterns and plant species is known as a biome. The earth is filled with a variety of climates that give life to different plant species.
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