Sometimes lakes are formed by flowing rivers, sometimes they're made by humans. But what lake was formed when Mount Mazama collapsed almost 8,000 years ago?

About 7,700 years ago, Mount Mazama erupted and then collapsed, creating a caldera that became crater lake, which is nearly 2,000 feet deep. Because of the unique way it was formed, Crater Lake has no rivers flowing into or out of it. As water evaporates, it's replaced by rain and snowfall.

Asked by Tom Cohen · Last updated 5 years ago · 496 views