How were the waterfalls in yosemite made?

Answer 1

The cascading waterfalls in Yosemite were made possible by the glaciers that carved Yosemite Valley, which gave the cliffs needed to make the impressive drops possible. The rivers that feed the waterfalls themselves are mostly from snow melt, so often times don't last too long into the summer. Some waterfalls like Vernal Falls, Nevada Falls, and Bridalveil Falls have water year-round, expect of course, in the winter when they become frozen.