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Lava is molten or partially molten rock (magma) that has been expelled from the interior of a terrestrial planet (such as Earth) or a moon onto its surface. Lava may be erupted at a volcano or through a fracture in the crust, on land or underwater, usually at temperatures from 800 to 1,200 °C (1,470 to 2,190 °F).
24 kwi 2017 · Learn about the three main categories of igneous rocks: extrusive, intrusive and hypabassal. Find out how lava cools and solidifies to form different types of rocks, such as basalt, granite and andesite.
23 wrz 2024 · lava, magma (molten rock) emerging as a liquid onto Earth’s surface. The term lava is also used for the solidified rock formed by the cooling of a molten lava flow. The temperatures of molten lava range from about 700 to 1,200 °C (1,300 to 2,200 °F).
Basalt (UK: / ˈ b æ s ɔː l t,-əl t /; [1] US: / b ə ˈ s ɔː l t, ˈ b eɪ s ɔː l t /) [2] is an aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the surface of a rocky planet or moon.
Arguably the most influential factor determining how fast lava cools is the thickness of the flow. Other factors include heat loss from both the top (to the atmosphere) and bottom of a flow (into the ground). Contributing to heat loss at the flow's surface are air temperature, rainfall, and wind.
Igneous rock is formed by the cooling and solidification of magma or lava. Learn about intrusive and extrusive igneous rocks, their geological significance, formation and examples.
21 cze 2019 · If there is a good time gap between the first and second flow then the lava flows from the first eruption have the time to cool and crystallize. When the second eruption starts, sometimes the new lava will flow beneath the cooled lava. This causes the cooled lava flows to rise and inflate.
