Lava is molten or partially molten rock 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). The volcanic rock resulting from ...

2025年1月19日 · 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).

At its core, lava is molten rock expelled by a volcano during an eruption. It originates deep within the earth, where temperatures are high enough to melt rock. When pressure builds up in the earth’s crust, this molten rock finds its way to the surface, erupting as lava.

Lava flow - An outpouring of molten rock from a vent onto Earth's surface during an effusive volcanic eruption; also the resulting solidified body of rock. Magma - Molten rock beneath Earth’s surface capable of intrusion and extrusion.

2024年11月15日 · Volcanoes occur where magma — molten rock from within the Earth — breaks through to the surface. There, it becomes known as lava. This regularly happens where the Earth’s tectonic plates are drifting apart, such as at mid-ocean ridges (left). Here, the mantle pushes through the gap and melts, making magma.

A volcanic eruption is the expulsion of gases, rock fragments, and/or molten lava from within the Earth through a vent onto the Earth’s surface or into the atmosphere. Illustration of the basic process of magma formation, movement to the surface, and eruption through a volcanic vent.

Magma (sometimes colloquially but incorrectly referred to as lava) is found beneath the surface of the Earth, and evidence of magmatism has also been discovered on other terrestrial planets and some natural satellites. [3] Besides molten rock, magma …

Molten rock below the surface of the Earth that rises in volcanic vents is known as magma, but after it erupts from a volcano it is called lava. Magma is made of molten rock, crystals, and dissolved gas—imagine an unopened bottle of soda with grains of sand inside.

Lava is molten rock expelled by a volcano during an eruption. (When the molten rock is beneath the Earth's surface, it is called magma.) When first exuded from a volcanic vent, the hot lava is at temperatures ranging from 700 °C to 1,200 °C (1,300 °F to 2,200 °F).

2024年12月16日 · A volcanic eruption is an eruption of molten rock, hot rock fragments, and hot gases through a volcano, which is a vent in a planet’s or satellite’s crust. Volcanic eruptions can cause disastrous loss of life and property.