2.
Crater Lake.
volcano.si.edu.
Global Volcanism Program.
"The spectacular 8 x 10 km Crater Lake caldera in the southern Cascades of Oregon formed about 7,700 years ago as a result of the collapse of a complex of overlapping shield and stratovolcanoes known as Mount Mazama."
3.
History of Crater Lake (PDF).
Official Website of Crater Lake.
"Makalaks (now Klamath Indians) held the belief that this place was so holy that looking upon it would lead to death.... Even today, some Native Americans choose not to view Crater ake. Its beauty and mystery form a religious context. As you explore this place of earthly violence and unearthly quiet, honor its sacred qualities."
