Why do volcanoes erupt Commonlit answer key?

Why do volcanoes erupt Commonlit answer key?

[1]The rock inside the planet we live on can melt to form molten turned to liquid by heat 1 rock called magma. This magma is lighter than the rocks around it and so it rises upwards. Where the magma eventually reaches the surface we get an eruption and volcanoes form.

What is the nature of volcanic eruption?

If so, an eruption begins, and the molten rock may pour from the vent as nonexplosive lava flows, or it may shoot violently into the air as dense clouds of lava fragments. Larger fragments fall back around the vent, and accumulations of fall-back fragments may move downslope as ash flows under the force of gravity.

What is volcanic eruption answer in one sentence?

A volcanic eruption is when lava and gas are released from a volcano—sometimes explosively. The most dangerous type of eruption is called a ‘glowing avalanche’ which is when freshly erupted magma flows down the sides of a volcano. They can travel quickly and reach temperatures of up to 1,200 degrees Fahrenheit.

What are the three natures of a volcanic eruption?

Volcanic eruptions arise through three main mechanisms: Gas release under decompression causing magmatic eruptions. Thermal contraction from chilling on contact with water causing phreatomagmatic eruptions. Ejection of entrained particles during steam eruptions causing phreatic eruptions.

Why do volcanoes erupt Commonlit answer key quizlet?

Why do volcanoes erupt? Magma under pressure and in that liquid rock is gas and once you release the pressure it explodes. It finds a fracture to release the pressure.

What causes a volcanic eruption *?

Although there are several factors triggering a volcanic eruption, three predominate: the buoyancy of the magma, the pressure from the exsolved gases in the magma and the injection of a new batch of magma into an already filled magma chamber. This lighter magma then rises toward the surface by virtue of its buoyancy.

What factors determines the nature of volcanic eruption?

The primary factors that determine the nature of volcanic eruptions include the magma’s temperature, its composition, and the amount of dissolved gases it contains. As lava cools, it begins to congeal, and as viscosity increases, its mobility decreases. The viscosity of magma is directly related to its silica content.

Is volcanic eruption a natural disaster?

What Is A Volcanic Eruption? A volcanic eruption is one of the most dangerous and magnificent natural disasters. When a volcano erupts, the volcano sends out ash clouds, lava and even volcanic bombs.

What causes volcanic eruption short answer?

Volcanoes erupt when molten rock called magma rises to the surface. Magma is formed when the earth’s mantle melts. Another way an eruption happens is when water underneath the surface interacts with hot magma and creates steam, this can build up enough pressure to cause an explosion.

What causes volcanic eruptions?

When enough magma builds up in the magma chamber, it forces its way up to the surface and erupts, often causing volcanic eruptions. Magma from Earth’s upper mantle rises up to fill these cracks. As the lava cools, it forms new crust on the edges of the cracks.

How does lava affect the surface of Earth?

Volcanoes change the earth’s surface by allowing molten rock, or magma, to escape the earth and create rock formations or mountains. When magma erupts from the earth in the form of lava, it cools very quickly due to the much cooler atmospheric temperatures. This changes the topography of the earth.

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