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An example is the massive Level Mountain shield volcano in northern British Columbia, Canada, which covers an area of 1,800 km 2 (690 sq mi) and a volume of 860 km 3 (210 cu mi). [ 1 ] Perhaps the most extensive of all the subaerial basaltic plateaus existed during the Paleogene [ 2 ] and possibly extended over 1,800,000 km 2 (690,000 sq mi) of ...
The most important types of volcanic mountain are composite cones or stratovolcanoes and shield volcanoes. [10] [11] A shield volcano has a gently sloping cone because of the low viscosity of the emitted material, primarily basalt. Mauna Loa is the classic example, with a slope of 4°-6°.
The geology of the Canary Islands is dominated by volcanoes and volcanic rock. The Canary Islands are a group of volcanic islands in the North Atlantic Ocean, near the coast of Northwest Africa. The main islands are Lanzarote, Fuerteventura, Gran Canaria, Tenerife, La Gomera, La Palma, and El Hierro. [Note 1] There are also some minor islands ...
Sound – A long, relatively wide body of water, connecting two larger bodies of water. Spit – Coastal bar or beach landform deposited by longshore drift. Strait – Naturally formed, narrow, typically navigable waterway that connects two larger bodies of water. Strandflat – Type of landform found in high-latitude areas.
Volcanic dams (1 C, 4 P) Volcanic fields (8 C, 87 P) Volcanic groups (2 C, 53 P) Volcanic plateaus (4 C, 13 P) Volcanic plugs (2 C, 2 P, 1 F) Volcanoes (28 C, 20 P) Volcanogenic lakes (2 C, 1 P)
Geology of the United States. Shaded relief map of the United States, showing 10 geological provinces. The richly textured landscape of the United States is a product of the dueling forces of plate tectonics, weathering and erosion. Over the 4.5 billion-year history of the Earth, tectonic upheavals and colliding plates have raised great ...
A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. The process that forms volcanoes is called volcanism. On Earth, volcanoes are most often found where tectonic plates are diverging or converging, and because most of Earth ...
Solidified lava flow in Hawaii Sedimentary layers in Badlands National Park, South Dakota Metamorphic rock, Nunavut, Canada. Geology (from Ancient Greek γῆ (gê) 'earth' and λoγία () 'study of, discourse') [1] [2] is a branch of natural science concerned with the Earth and other astronomical objects, the rocks of which they are composed, and the processes by which they change over time. [3]