Life

Which is true about a volcanic eruption?

Which is true about a volcanic eruption?

When pressure builds up, eruptions occur. In an eruption, gases and rock shoot up through the opening and spill over or fill the air with lava fragments. Eruptions can cause lava flows, hot ash flows, mudslides, avalanches, falling ash and floods. The danger area around a volcano covers about a 20-mile radius.

Which statement is true about magma and volcanoes?

Which statement is true about magma and volcanoes? A high viscosity magma will flow more readily and easily than a low viscosity magma. Therefore the eruption will be fluid and passive. A high viscosity magma will flow more readily and easily than a low viscosity magma.

How do volcanic eruptions happen?

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.

Where do volcanic eruptions happen?

Sixty percent of all active volcanoes occur at the boundaries between tectonic plates. Most volcanoes are found along a belt, called the “Ring of Fire” that encircles the Pacific Ocean. Some volcanoes, like those that form the Hawaiian Islands, occur in the interior of plates at areas called “hot spots.”

What are 10 interesting facts about volcanoes?

10 Interesting Facts About Volcanoes

  • There are Three Major Kinds of Volcanoes:
  • Volcanoes Erupt Because of Escaping Magma:
  • Volcanoes can be Active, Dormant or Extinct:
  • Volcanoes can Grow Quickly:
  • There are 20 Volcanoes Erupting Right Now:
  • Volcanoes are Dangerous:
  • Supervolcanoes are Really Dangerous:

Why do volcanic eruptions generated by mafic magma form shield volcanoes?

So, mafic lavas are hot , low in silica and volatiles, and have relatively low viscosity. Their high volatile content makes them potentially highly explosive. Shield Volcanoes. Because mafic lava is low viscosity, when it erupts from a volcano it flows downslope away from the vent, gradually cooling and crystallizing.