Junior Ranger

Crater Lake National Park Flashcards

Photo cards, one fact each. Big and Little made them.

Card 1 of 10
Deep blue Crater Lake sitting inside tall gray caldera walls under a clear sky.
Photo: Zainubrazvi / Wikimedia Commons (CC BY-SA 3.0)

About 7,700 years ago the volcano Mount Mazama erupted and its top fell in. That left a giant bowl called a caldera, which slowly filled with water.