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Welcome to our wiki space this is a project that our teacher is letting us do. I hope you can find everything that you need. Andrew P Ethan lake with mountian Great Lakes map of earth with lakes

The Sierra Nevada range has the wetter portions of the nation, with average rainfall exceeding 30 inches (76 cm) per year. The climates vary a lot. The northern and polar lakes are mostly the same all over the world. Temperature varies in ponds and lakes seasonally. During the summer, the temperature can range from 4° C near the bottom to 22° C at the top. During the winter, the temperature at the bottom can be 4° C while the top is 0° C. In between the two layers, there is a narrow zone called the thermo cline where the temperature of the water changes quickly. During the spring and fall seasons, there is a mixing of the layers, usually due to winds, which results in a usual water temperature of around 4° C. This mixing also circulates oxygen throughout the lake. Of course there are many lakes and ponds that do not freeze during the winter, thus the top layer would be a little warmer.

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