A lava flow is an outpouring of lava during an effusive eruption. (An explosive eruption, by contrast, produces a mixture of volcanic ash and other fragments called tephra, not lava flows.)

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Jun 11, 2025 · 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.

What Is Lava Made Of? Looking down at a cooled lava flow, you see a black, glassy, vesicular (“spongy”) rock. The black color comes from the magnesium and iron-rich minerals, which are …

Learn about lava, the molten rock that erupts from volcanoes and its types, formation process, and the transformative impact it has on Earth's surface and ecosystems.

Oct 26, 2022 · Learn about the types of lava including the forms of lava flow (pahoehoe and a'a) and the chemical composition based on silica content.

1 day ago · Department of the Interior Secretary Doug Burgum is restoring common sense to American energy policy by reversing the Biden administration’s misguided, last-minute push to …

Jun 11, 2018 · lava Molten rock, normally a silicate, erupted by a volcano. It may be vesicular, glassy, or porphyritic in texture, and varies between acidic and basic in composition.

Jul 30, 2025 · Lava planets challenge everything we think we know about terrestrial worlds. They are typically Earth- to super-Earth–sized, yet they orbit their stars in less than a single Earth day.

Dec 18, 2018 · "Lava" is a molten rock that erupts from a volcano during the eruption. When erupting from volcanoes, it is liquid at a temperature of about 700 ° C to 1,200 ° C (1,300 ° F to …