Morning Star solutions for Total Geography [English] Class 9 ICSE chapter 7 - Volcanoes [Latest edition]

The forces arising from the interior of the earth:

A vent in the earth’s crust from which fiery hot magma erupts from the earth’s interior:

Which of the following is NOT a cause of volcanic eruptions?

Which amongst the following is NOT a product of volcano?

During repeated eruptions the summit of a volcano may be blown up, leaving a large depression called ______.

Assertion (A): Most volcanic eruptions take place near plate margins.

Reason (R): When these plates slide past each other or collide against each other due to intense heat inside the earth’s core, their edges produce faults along the lines of weakness.

______ is a fountain of hot water and steam that escapes when underground water comes into contact with hot volcanic rocks.

Which of the following is incorrect?

Assertion (A): Steam is the most abundant gas that comes out of a volcano.

Reason (R): Violent eruptions, known as bombs, eject materials varying in size.

Which of the following is NOT a constructive effect of volcanoes?

The volcanoes that occur near Earthquake belts and tectonic plate boundaries:

Mt. Vesuvius, Mt. Etna are located in the ______.

______ are also known as Thermal Springs.

Assertion (A): The lava and ash deposited during an eruption break down to provide valuable nutrients for the soil and thus create fertile soil.

Reason (R): Agricultural fields are covered with layers of volcanic ash and dust, making them unsuitable for cultivation.

The area marked brown colour on the map given above is referred to as the Pacific Ring of Fire. Why is it so called?

What is a volcano?

Give one example of a volcano.

What is the difference between magma and lava?

Give one example of an active volcano.

Give one example of a dormant volcano.

What is the difference between a dormant volcano and an extinct volcano?

What is the magma chamber of a volcano?

State the products erupted by a volcano.

Name two types of landforms made by volcanoes. Give an example of each type.

Describe the two causes of volcanic eruptions.

Give a geographical reason for the following:

Many volcanoes are found along plate boundaries.

Give a geographical reason for the following:

Volcanic mountains are the most diverse mountains in the world.

Give a geographical reason for the following:

Hot springs have medicinal properties to cure skin diseases.

Draw a well labelled diagram showing the different parts of a volcano and the products erupted by it.

Explain briefly the landforms created by volcanoes on the surface of the earth.

Write any three destructive effects of volcanoes.

Explain the following term:

Volcanic Cone

Explain the following term:

Caldera

Explain the following term:

Geyser

Describe the world distribution of volcanoes.

Imagine that you had gone for a holiday and an extinct volcano erupted. List the consequences.

Suppose you are living in an area known for volcanic eruptions. One day, when you were sitting in your balcony, you suddenly noticed a volcano erupting at a distance. State what happened thereafter.

Using your knowledge of chemistry, make a model of a volcano to study the extent of damage that can be caused by a volcanic eruption. Extrapolate your calculations to predict the energy released during the last few volcanic eruptions.

Recently there was a news article regarding the closure of Manila’s international airport following a major volcanic eruption of the Taal Volcano. On the map of the world locate the Taal Volcano. What inference do you draw from the location of the volcano? Correlate your findings with news articles of the eruption. Make a list of potential eruption-prone volcanoes that could cause closure of international airports in other countries. Mark them on an outline map of the world.