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Most lakes remain filled with water, except after/during a drought. Depending on environmental conditions, lakes can "go dry", such as in SW USA. Lakes can be fed from underground or from streams, tributaries, and rivers. Some lakes came into being as a result of human planning.

An oasis typically has a small water source, fed from underground and rain but never from streams, tributaries or rivers. It can also 'go dry'. Oasis areas are typically NOT man made.

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13y ago

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