The answer to your question is complicated because lakes are made in a variety of different ways, which include: glacial activity, techtonic movement, volcanic activity, river erosion, wind erosion, and more. And those are only the natural ways! Man-made lakes are pretty common nowadays, and in fact, most reservoirs are man-made.
Ask a question about a particular type of lake formation for more information.
If I may rephrase your question to how were lakes made,,,,
Glaciers have been the most common contributor to lakes (Great Lakes are a great example). When Glacierts move across land, their enormous mass would collapse the earth in weak spots, forming hills, fjords and depressed areas that would fill with water and eventually become bodies of water.
Geological Activity is also responsible for many bodies of water. Rising mountain, moving tectonic plates and volcanos can cause wells in the earth. Volcanic lava can cause this as well as if a volcano would collapse onto itself, forming a depression that would turn into a lake when water collects (Crater Lake).
Those are the 2 most common lake forming techniques. Please look at the links for more.
Artificial or man made lakes can be and have been made in several ways. As far as intentionally, reservoirs are very popular. Constructing a dam in river or stream valleys creates a lake and the purposes are power generation, flood control, navidation, water supply and recreation.
Unintentioannly, lakes can be formed from abandoned mining operations and pits.
And beavers, of course! With all their schemes and plotting against us.
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