What is volcanic eruption short answer?

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. Volcanic Eruption.

What is volcanic eruption and its causes?

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 is a volcanic eruption called?

There are two predominant types of volcanic eruptions: Effusive eruptions. magma rises through the surface and flows out of the volcano as a viscous liquid called lava. Explosive eruptions. magma is torn apart as it rises and reaches the surface in pieces known as pyroclasts.

What is volcanic eruption Class 9?

Volcanic eruptions happen when lava and gas are discharged from a volcanic vent. The most common consequences of this are population movements as large numbers of people are often forced to flee the moving lava flow. Volcanic eruptions often cause temporary food shortages and volcanic ash landslides called Lahar.

How are volcanoes caused Class 9?

Answer: The main causes of volcanic eruptions are the following : Heat and Pressure inside the Earth : Temperature and pressure both increase from the surface towards the centre of the earth. Magma Chamber : The molten material while still under the earth’s crust melts weak rocks and creates a huge chamber for itself.

Is volcanic eruption a natural disaster?

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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.

Are all volcanic eruption the same?

No, the same volcano can produce different magmas at different times and sometimes even in the same eruption. It depends on what has melted to form the magma in the magma chamber and what this magma has mixed with on its way to the surface.

What are the 3 types of volcanoes?

There are three types of volcanoes: cinder cones (also called spatter cones), composite volcanoes (also called stratovolcanoes), and shield volcanoes. Figure 11.22 illustrates the size and shape differences amongst these volcanoes. Shield volcanoes, which get their name from their broad rounded shape, are the largest.

What is a volcano Class 10?

A volcano is a landform, a mountain, where molten rocks erupt through the surface of the planet. The volcano mountain opens downwards to a pool of molten rocks underneath the surface of the earth. Gases and igneous rocks shoot up and splash over or fill the air with lava fragments.

What is volcano for Class 7th?

A volcano is a vent from which a combination of melted rock, solid rock debris and gas erupts. It has a reservoir of molten material below the surface (magma chamber) called magma, and when this magma rises to the surface, it is called lava.

What is volcano Class 7 short?

An opening in the earth’s crust that allows hot molten lava, ash and gases to escape from below the surface, is called a volcano.