Crater lake

blue lagoon

Crater lakes are formed when the top of a volcano collapses, forming an empty hole that fills with water. These natural disasters can be quite dangerous to humans as they destroy anything in their path and cause widespread chaos. Humans have also been known to create crater lakes by exploding large amounts of explosives underground which causes another type of eruption called phreatomagmatic eruptions–these explosions send up huge quantities of hot rocks into the air from deep below ground or undersea
A typical crater lake is about 3 km across (2 miles). Examples include Crater Lake on Mount Mazama in Oregon; Monte Nuovo, Italy’s newest volcanic cone near Avellino; Newberry Caldera at Newberry National Volcanic Monument east-southeast from Bend.

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