Volcanoes

Magma is hot molten rock from deep within the Earth.

A volcano forms when magma rises toward the Earth's surface and collects in magma chambers, and then is expelled through a vent or fissure in the Earth's surface as a volcanic eruption.

Magma is liquid rock in the middle of the Earth, while lava is liquid rock that is leaving the Earth.

<p>An active volcano is a volcano that has erupted at least once in the past 10,000 years.</p> Signup and view all the answers

<p>Plate tectonics is a theory that states the Earth's crust is broken up into plates, and these plate-like sections of crust are called tectonic plates.</p> Signup and view all the answers

<p>Many active volcanoes occur due to plate tectonics, where magma can escape in a volcanic eruption at the boundaries between tectonic plates.</p> Signup and view all the answers

<p>The Ring of Fire is an area of the Pacific Ocean Basin that is tectonically active.</p> Signup and view all the answers

<p>When pressure builds within magma chambers, magma is expelled through a vent or fissure in the Earth's surface as a volcanic eruption.</p> Signup and view all the answers

<p>Hot molten rock outside of a volcano is called lava.</p> Signup and view all the answers

<p>The two main components of a volcano are magma chambers, where magma collects, and vents or fissures, through which volcanic eruptions occur.</p> Signup and view all the answers