In the case of a waterfall, where does the rest of the water come from, and where does it end up?
a) The water comes from underground springs, and it ends up in an underground reservoir.
b) The water comes from rain and ends up in an ocean or a large body of water.
c) The water comes from melting glaciers, and it ends up in rivers and lakes.
d) The water comes from a secret source, and it disappears mysteriously.
