Geology and landforms
Crater lake National park have igneous rock . the rock formed by the solidification of magma. this magma originates far below the surface and the temperature is high enough to melt the rock. want the rock cooling it formed the rock may consist of large crystals, called Phenocrysts, embedded in a fine grained or glassy matrix called a groundmass. This rock, containing both large and small crystals, is called a porphyry Crater lake national park have two general classes of igneous rocks the name of the are intrusive or plutonic, and extrusive or volcanic rocks. Crater lake National park is formed by natural forces only recently constructed this landscape. first lava flows and high plateau explosive and built the cascade volcanoes. it may be probably the eruption of Mount Manama was about 7700 years ago.
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crater was the clean, clear, and the cold lake water it doesn't have fish for a long time but in 1888 to 1941 human introduced fish for the crater lake. The plateau of the Cascade Range was built as the Earth's crust folded , pushing seas to toward. Molten rock pushed toward the surface, creating very violent eruptions and the of lava through bad cracks. In geologic time the last 750,000 years about explosive eruptions built a string of volcanoes on this plateau base. This Cascade Range of volcanoes extends from Canada's Mount Garibaldi to Lassen Peak in northern California. and great volcanoes mount named Mount Manama it is holds crater Lake.
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