[1 Mark Question Answer]

Question 11 Mark

What are known as Shield volcanoes?

Answer

Volcanoes erupting with plentiful lava spreading over the surface into several kilometers with huge circumference and taking a shape of shield are called as shield volcanoes.

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Question 21 Mark

What is called the Pacific Ring of Fire? Why is it called so?

Answer

There are 80% active volcanoes around the Pacific ocean which is called the Ring of Fire

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Question 31 Mark

What is the magma chamber of a volcano?

Answer

The magma chamber is created by the molten magma itself by melting the surrounding rocks in the form of a huge chamber.

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Question 41 Mark

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

Answer

Dormant volcano can erupt at any interval but extinct volcano can never erupt again.

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Question 51 Mark

Give one example each of an active volcano and a dormant volcano.

Answer

Active Volcano – Mt. Stromboli and Mt. Etna in Italy
Dormant Volcano – Mt. Kilimanjaro of Africa.

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Question 61 Mark

What is the difference between magma and lava?

Answer

Molten material moving under the earth’s crust is called magma. When magma comes to the surface of the earth it is known as lava

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Question 71 Mark

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

Answer

Dormant volcano can erupt at any interval but extinct volcano can never erupt again.

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Question 81 Mark

Give an example each of conical volcano and fissure volcano.

Answer

Mount Fuji in Japan is a conical volcano and Columbia plateau in South America and Deccan plateau in India are the examples of fissure volcanoes.

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Question 91 Mark

What is called the Pacific Ring of Fire? Why is it called so?

Answer

There are 80% active volcanoes around the Pacific ocean which is called the Ring of Fire

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Question 101 Mark

How are hot springs formed?

Answer

The movement of magma heats up the underground water which converts into steam and gushes out through any crack or holes on the crust.

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Question 111 Mark

What are known as volcanoes?

Answer

Volcanoes are the vents in the earth’s crust erupting hot magma from the interior core motivated by endogenic forces.

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Question 121 Mark

Indicate the world distribution of active volcanoes.

Answer

There are about 500 active volcanoes. Most of them are confined to Circum-Pacific Belt and Mid World Mountain Belt.

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Question 131 Mark

What is epicentre?

Answer

The point on Earth’s surface vertically above the focus is called the epicentre.

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Question 141 Mark

In which belt most of the volcanoes of the world are found?

Answer

Circum Pacific Belt.

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Question 151 Mark

The vent of a volcano when blocked results in an explosive eruption.

Answer

It causes the pressure to build up which results in violent explosion.

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Question 161 Mark

Plate margins are zones of great volcanic activity.

Answer

Plate margins are zones of great volcanic activity because collisions of plate margins produce the magma and allow it to escape through a vent, a fissure, or a crack.

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Question 171 Mark

Earthquakes are common in the belt of young fold mountains.

Answer

Earthquakes are common in the belt of young fold mountains because these mountains are in a state of constant flux.

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Question 181 Mark

Hot springs are common in volcanic regions.

Answer

Hot springs are common in volcanic regions because underground water gets heated by contact with hot magma.

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Question 191 Mark

Some volcanoes develop parasitic cones.

Answer

Some volcanoes develop parasitic cones because the main vent grows too high and develops a parasite or a branch l cone.

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Question 201 Mark

Some volcanoes erupt explosively.

Answer

Some Volcanoes erupt explosively because of the vent of a volcano. maybe blocked by some sticky material or rock which causes the explosion.

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Question 211 Mark

Out of the following words write down the four that are connected with volcanic activity.
Karst, crater, drumlin, stalactites, gully, pot holes, ash, basalt, swallow holes, dyke, domes, bluffs.

Answer

Crater, ash, basalt, dyke are connected with volcanic activity.

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Question 221 Mark

The Circum-Pacific Belt of volcanoes is called ‘The Ring of Fire’.

Answer

The circum-pacific belt is truly known as “The Belt of Fire” or “The Ring of Fire” as 75% active volcanoes erupting fire are located in this belt.

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Question 231 Mark

Cinder Cone

Answer

Cinder Cone - The volcanic cone built of small pieces and fragments of solidified lava and ash is called ‘Cinder Cone’.

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Question 241 Mark

‘Ring of Fire’

Answer

‘Ring of Fire’ - It is the belt around the pacific ocean where due to the weak crust 75% of active volcanoes exist forming a huge ‘ring of fire’ phenomenon.

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Question 251 Mark

Epicentre

Answer

Epicentre : The point on the earth’s surface directly above the ‘focus’ of earthquake is called epicentre.

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Question 261 Mark

Mud volcanoes

Answer

Mud Volcanoes — A volcanic cone made of the mud due to the eruption of muddy water is called a mud volcano.

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Question 271 Mark

Caldera

Answer

Caldera is the spacious crater of a volcano created by tremendous eruption. Crater lake in Oregon U.S.A occupies a caldera about 9 kilometers in diameter.

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Question 281 Mark

Which volcano is known as the ‘lighthouse of the Mediterranean?

Answer

Stromboli

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Question 291 Mark

Which four of the following words are connected with volcanic activity:
Karst, crater, drumlin, stalactite, gully, potholesl, ash, basalt, swallow, holes, dyke, domes, bluffs.

Answer

Crater, ash, dyke, domes.

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Question 301 Mark

The region where there are highest number of geysers and hot springs.

Answer

Yellow stone park (U.S.A.)

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Question 311 Mark

The surface position immediately above the origin of an earthquake.

Answer

Epicentre

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Question 321 Mark

An instrument used for recording all the earth tremors and earthquakes.

Answer

Seismograph

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Question 331 Mark

A volcano whose eruption buried and destroyed two Roman towns.

Answer

Vesuvius

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Question 341 Mark

A volcano where magma reaches the surface through a vent or a pipe..

Answer

Central type volcano

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Question 351 Mark

A large sill of acid lava which has solidified gradually giving a dome-like shape.

Answer

Acid-Lava Dome

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Question 361 Mark

A volcano which has the possibility of erupting in future.

Answer

Dormant Volcano

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Question 371 Mark

The lava which is poor in silica and rich in iron and magnesium.

Answer

Basic-Lava

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Question 381 Mark

The funnel shaped hollow at the top of a volcanic cone.

Answer

Crater

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Question 391 Mark

A narrow block elevated between two normal faults.

Answer

Horst

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Question 401 Mark

The Circum-Pacific Belt of volcanoes is called ‘The Ring of Fire’.

Answer

The circum-pacific belt is truly known as “The Belt of Fire” or “The Ring of Fire” as 75% active volcanoes erupting fire are located in this belt.

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Question 411 Mark

What is the following: Cinder Cone

Answer

Cinder Cone - The volcanic cone built of small pieces and fragments of solidified lava and ash is called ‘Cinder Cone’.

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Question 421 Mark

What is the following: ‘Ring of Fire’

Answer

‘Ring of Fire’ - It is the belt around the pacific ocean where due to the weak crust 75% of active volcanoes exist forming a huge ‘ring of fire’ phenomenon.

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Question 431 Mark

What is epicentre?

Answer

The point on Earth’s surface vertically above the focus is called the epicentre.

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Question 441 Mark

What is the following: Mud volcanoes

Answer

Mud Volcanoes — A volcanic cone made of the mud due to the eruption of muddy water is called a mud volcano.

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Question 451 Mark

What is the following: Caldera

Answer

Caldera is the spacious crater of a volcano created by tremendous eruption. Crater lake in Oregon U.S.A occupies a caldera about 9 kilometers in diameter.

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Question 461 Mark

What is the following: Spine or plug

Answer

The volcanic cone made by the quick solidification of viscous lava and having steep slopes is known as the spine or plug.

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Question 471 Mark

What is the following:
Fissure type of volcanoes

Answer

Some times the volcanic eruption takes place through several small holes which are known as fissure type volcanoes.

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Question 481 Mark