Crater lake lies inside the top of an ancient volcano known as Mount Mazama. 

Type of volcano: 

• cinder cone what became Caldera. The caldera formed about 6800 years ago as a result of the eruption of about 75 km3 of rhyolite magma in the form of tephra, found as far away as Canada, accompanied by pyroclastic flows that left thick deposits of tuff on the flanks of the volcano. Subsequent eruptions have built a cinder cone on the floor of the caldera, which now forms an island called Wizard Island. 
  
• continental

Geologic location: America, state of Oregon.

The cities nearby:Ashland (56,5 miles),Grants pass(78.6 miles),Medford( 80 miles)Bend(88 miles),  Eugene(91.7 miles).

Closest Volcano: Davis Lake

• Non-explosive
• Basaltic lava
• The hazarrds is Pyroclastic flow
  
• The only damage crater lake does to any towns or roads is from pyroclastic flows that will rip tear and kill anything in is path
  
• There is lot earthquakes from crater lake magnitudes at 5.9 and 6.0, those earthquakes are damaging to the town
• the most damaging thing to people from wizard island is a pyroclastic flow. Pyroclastic flow it reaches farther away from crater lake and moves quickly.  After an eruption ash clouds will cover some of crater lake but  the clouds will not go into any towns. 
  

Crater Lake lies in the caldera of a Cascades volcano. The Cascades are the result of the small Juan de Fuca plate being subducted under the North American plate (convergent boundary), partially melting, then rising as magma to form a chain of volcanoes. Since the surface boundary between the plates is offshore, the volcanoes themselves are located on the North American plate.