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Lakes are large bodies of water that are surrounded by land and are not part of the ocean. Lakes can contain either salt or fresh water and are larger than ponds. Lakes are still bodies of water, when compared to a river where the water flows. Usually rivers or streams flow into a lake and drains water when it gets too full. There are millions of lakes in the world. There are both man-made lakes and natural lakes. Some lakes were formed by glaciers that scraped along the ground forming basins as they moved along. When the glaciers melted the basins filled with water. Lakes can even be formed by volcanoes.
Groundwater is water held underground in the soil or in pores in rocks. The earth has been recycling water for 4 billion years. The water cycle has no beginning or end. It is continuous. The sun heats up the water from the oceans, lakes and rivers. The water changes into water vapor by the process of evaporation. Plants also lose water in the form of water vapor from their leaves into the air by the process of transpiration. Water collects of water vapor in the sky and makes clouds. When the water in the clouds gets cold it becomes liquid again in a process called condensation. Then the water falls from the sky as rain, snow, sleet or hail called precipitation. The water sinks into the surface and collects into lakes, oceans and rivers. It evaporates all over again and continues the cycle.