lakes and ponds form when water collects in hollows and low-lying areas of land; a river channel can form a lake as it changes over time; it bends and loops as it encounters obstacles in its path; eventually a new channel might form, cutting off a loop. read more
Water collects in hollows and low lying areas of land,water fills in the craters of old volcanoes,ice melts in depressions created by ice sheets,and water collects behind a dam built across a river. read more