What is volcano?

Question

What is volcano?

Answer

A volcano is little bit similar formation like of mountain and it has vent on its top through that the heat inside the earth in short lava erupts

Answer

A mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapour, and gas are or have been erupted from the earth's

Answer

What is a Volcano?

A volcano is a geological formation on Earth's surface that is formed when molten rock, ash, and gases escape from below the Earth's crust. It is essentially an opening or rupture in the Earth's surface through which these materials erupt, creating a mountain-like structure. Volcanoes can be found on land or underwater, and they are often associated with tectonic plate boundaries, where the Earth's crust is either colliding, separating, or sliding past each other.

Formation of Volcanoes

Volcanoes are formed through a complex process involving the movement of tectonic plates, which make up the Earth's surface. When these plates collide or separate, they create areas of intense heat and pressure beneath the Earth's crust. This heat causes the rocks to melt and form a molten material known as magma. The magma is less dense than the surrounding rocks, so it rises towards the surface, eventually finding a way to escape through a volcano.

Structure of a Volcano

A volcano has several distinct features that contribute to its structure:

1. Magma Chamber: This is the reservoir where molten rock accumulates beneath the Earth's surface. It acts as a storage area for magma before it erupts.

2. Conduit: The conduit is a vertical pipe-like channel that connects the magma chamber to the surface. It allows the magma to flow upward during an eruption.

3. Crater: The crater is a bowl-shaped depression at the top of the volcano. It is formed as a result of explosive eruptions or the collapse of the volcano's summit.

4. Vent: The vent is the opening through which magma, gases, and volcanic ash are expelled during an eruption.

Types of Volcanoes

There are several types of volcanoes, classified based on their shape, eruption style, and the type of lava they produce:

1. Shield Volcanoes: These volcanoes have a broad, gently sloping cone and are characterized by frequent eruptions of fluid lava. They are named after their resemblance to a warrior's shield.

2. Composite Volcanoes: Also known as stratovolcanoes, these volcanoes have steep sides and are composed of alternating layers of lava, ash, and volcanic debris. They are known for their explosive eruptions.

3. Cinder Cones: These are small, steep-sided volcanoes that consist of loose pyroclastic material (cinders) ejected during explosive eruptions.

4. Calderas: Calderas are large, basin-shaped depressions that form when a volcano collapses following a massive eruption or the emptying of a magma chamber.

Volcanic Hazards

Volcanoes pose various hazards, including:

- Pyroclastic Flows: These are fast-moving currents of hot gas, ash, and rock fragments that can engulf everything in their path.
- Lahars: Lahars are mudflows or debris flows formed when volcanic ash mixes with water, often triggered by heavy rainfall or melting snow.
- Ashfall: Volcanic ash can blanket large areas, disrupting transportation, damaging crops, and posing

Similar Class 7 Doubts

What is volcano?

What are the types of volcano?

What are the kinds of Volcano?

Define sea cliffs, meanders, earthquakes, volcano, loess, Focus, Epicenter, Weathering.?

What is a volcano?

Top Courses for Class 7View all

Science Class 7

Mathematics (Maths) Class 7

Social Studies (SST) Class 7

English Grammar Class 7

Worksheets with solutions for Class 7

Top Courses for Class 7

Top Courses for Class 7

Suggested Free Tests

Related Content

Class 7 Study Material

Class 7 Subjects

Competitive Examinations for Class 7

NCERT Books

Reference Books for Class 7

NCERT Solutions

Other Popular Exams

Company