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  2. Wells Gray-Clearwater volcanic field - Wikipedia

    en.wikipedia.org/wiki/Wells_Gray-Clearwater...

    Clearwater Lake, a lava dammed lake in the Wells Gray-Clearwater volcanic field. Based on radiocarbon and potassium-argon dating, volcanic activity in the Wells Gray-Clearwater volcanic field began in the early Pleistocene epoch, creating valley-filling and plateau-capping lava flows that have a total volume of approximately 25 km 3 (6 cu mi). [6]

  3. Geomunoreum Lava Tube System - Wikipedia

    en.wikipedia.org/wiki/Geomunoreum_Lava_Tube_System

    The Geomunoreum Lava Tube System (Korean: 거문오름 용암동굴계) is located between Seonheul-ri, Jocheon-eup and Weoljeong-ri, Gujwa-eup, Jeju City, Jeju Province, South Korea. This lava tube system refers to a series of lava tubes formed by multiple ancient eruptions of basaltic lava flow from the Geomunoreum volcano (elevation 456m ...

  4. Lava lake - Wikipedia

    en.wikipedia.org/wiki/Lava_lake

    Aerial view of a lava lake in Pu’u ’Ō’ō crater, east rift zone of Kīlauea. The crater is about 820 ft (250 m) in diameter. Aerial view of a lava lake atop the Kūpaʻianahā vent on the east rift zone of Kīlauea volcano. Lava lakes are large volumes of molten lava, usually basaltic, contained in a volcanic vent, crater, or broad ...

  5. Clear Lake Volcanic Field - Wikipedia

    en.wikipedia.org/wiki/Clear_Lake_Volcanic_Field

    Clear Lake Volcanic Field; Highest point; Elevation: 4,724 ft (1,440 m) [1] Coordinates: 2]: Geography; Location: Lake County, California, United States: Parent range: North Coast Ranges: Topo map: USGS Kelseyville: Geology; Rock age: less than 2.1 million years [3]: Mountain type(s): lava domes, cinder cones, maars within volcanic field [2]: Last eruption: Holocene [2]: Geologic map of the ...

  6. Lava Beds National Monument - Wikipedia

    en.wikipedia.org/wiki/Lava_Beds_National_Monument

    The oldest lava flow from the Medicine Lake Volcano within the monument is the Basalt of Hovey Point, near Captain Jack's Stronghold, which is 450,000 years old. Petroglyph Point was created about 275,000 years ago when cinders erupted through the shallow water of Tule Lake; violent explosions of ash and steam formed layers upon layers of tuff.

  7. Sand Mountain Volcanic Field - Wikipedia

    en.wikipedia.org/wiki/Sand_Mountain_Volcanic_Field

    Its total dense-rock equivalent eruptive output is 0.22 to 0.29 cubic miles (0.92 to 1.21 km 3), with subfeatures including a tephra field and a lava tube system. Future activity is possible, but according to the Volcano Hazards Program of the United States Geological Survey , the threat from the field itself is low.

  8. Lava filter - Wikipedia

    en.wikipedia.org/wiki/Lava_filter

    A lava filter is a biological filter that uses lavastone pebbles as support material on which microorganisms can grow in a thin biofilm. [1] This community of microorganisms, known as the periphyton , break down the odor components in the air, such as hydrogen sulfide .

  9. Water clarity - Wikipedia

    en.wikipedia.org/wiki/Water_clarity

    The term "water quality" more broadly refers to many characteristics of water, including temperature, dissolved oxygen, the amount of nutrients, or the presence of algal blooms. How clear the water appears is only one component of water quality. [1] [5] [47] An underwater ecosystem can have high water clarity yet low water quality, and vice versa.