Question

volcano eruption te presentation ds dou plz​

Answer 1

Answer:

Volcanoes are vents that allow lava, rock fragments and gases to escape from layers beneath the earth's surface. Learn how volcanoes form both on land and underwater and why they erupt Volcanoes.

Volcanoes are spectacular events and because of this, they have found their way into the plot of many Hollywood movies. While the movies have given most of us the vivid image of red-hot lava spewing out of the top of a towering volcano, they do not share the entire story of volcanoes. In this lesson, we will fill in some of the blanks left by Hollywood, as we learn how volcanoes form and why eruptions occur.

Magma and Lava

So what exactly is a volcano? Well, it can be defined as a vent in the earth's crust through which lava, rock fragments, hot vapor and gases are ejected. In other words, a volcano is the earth's way of letting off a little steam.

The super-heated particles that eject out of a volcano come from deep below the earth's surface where temperatures can become so hot that rock actually melts. Magma is the term used to describe this hot molten rock from deep within the earth.

A volcano begins to form when magma, which is less dense than the rock it originated from, rises toward the earth's surface. This liquid rock collects in chambers called 'magma chambers,' where pressure builds due to expanding steam and gases associated with the magma. As pressure reaches a peak within these chambers, magma finds its way through a vent or fissure in the earth's surface, resulting in a volcanic eruption and the expulsion of the hot molten rock.

We now have hot molten rock outside of a volcano, and its name changes from magma to lava. So you can think of 'magma' as liquid rock in the 'middle' of the earth and 'lava' as liquid rock that's 'leaving' the earth.

Explanation:

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