What is volcanic eruption in simple words?
Definition: A volcanic eruption occurs when magma is released from a volcano. Volcanic eruptions can be quite calm and effusive, or they can be explosive. Effusive eruptions produce lava flows, while explosive eruptions produce ash and pyroclastic density currents.
What happens during volcanic eruption?
A volcano is a vent in the Earth’s crust from which eruptions occur. When volcanoes erupt they can spew hot, dangerous gases, ash, lava and rock that can cause disastrous loss of life and property, especially in heavily populated areas.
What are the 3 stages of volcanic activity?
There are three stages of a volcano: active, dormant, and extinct.
- Active—A volcano is active if it is erupting, or may erupt soon.
- Dormant—A dormant volcano is one that may have erupted before, but it is no longer erupting.
- Extinct—An extinct volcano is not erupting and will never erupt again.
What are the 4 stages of a volcano?
Terms in this set (5)
- active. A volcano that has had at least 1 eruption in the past 10,000 years.
- erupting. Active volcano that is having an eruption right now (live)
- Dormant. (sleeping) Active volcano that is not erupting but is supposed to erupt again.
- Extinct.
- active, erupting, dormant, extinct.
How do volcanoes formed what are its two main processes?
When rock from the mantle melts, moves to the surface through the crust, and releases pent-up gases, volcanoes erupt. Extremely high temperature and pressure cause the rock to melt and become liquid rock or magma. When a large body of magma has formed, it rises thorugh the denser rock layers toward Earth’s surface.
How do you introduce a volcano?
Volcanoes erupt when magma, red-hot liquid rock, seeps up through a vent in the earth. More violent eruptions occur when pyroclastic material – a mixture of magma, rocks, ash, and hot gases – is exploded upward by pressure caused by underground gases and magma.
Why should students learn about volcanoes?
Students will learn how volcanoes form and grow. They will discover that not every mountain is a volcano. Students will be able to identify igneous rocks and to separate them into two groups: from magma (inside the earth, slow cooling) or from lava (outside the earth, fast cooling) according to rock characteristics.
What was the worst volcano eruption?
The 1985 Nevado del Ruiz volcanic eruption in Colombia was the worst eruption over the period of last 100 years, wherein as many as 23,000 people lost their lives.
What are the top 10 deadliest volcanoes?
Yellowstone Caldera,United States of America. The bubbling sulfuric hot springs and erupting geysers of Yellowstone national park have long attracted tourists from far and wide.
What is the greatest volcanic eruption in history?
The eruption of Mount Tambora in 1815 was a spectacular natural event that affected the entire world. Two hundred years ago, in 1815, the greatest volcanic eruption in recorded human history occurred. On April 10 and 11, 1815 Mount Tambora, a volcano located on the Indonesian island of Sumbawa , erupted.
What are the main causes of volcanic eruptions?
Causes of Volcanic Eruption. The buoyancy and the pressure of the gas within the earth’s crust cause the volcano to erupt. Magma is formed when the upper mantle of the earth melts. A volcano is erupted when the magma (the hot liquid) rises upwards by the pressure of gas that is dissolved in it.