Morning Star solutions for टोटल जियोग्राफी [अंग्रेजी] कक्षा ९ आईसीएसई chapter 4 - Earth’s Structure [Latest edition]

The molten material thrown up by volcanoes rises to the surface of the earth from the ______.

Meteors are rocks from outer space. They hold special significance for scientists because ______.

The earth is made up of several concentric layers. The correct order of the layers from the centre to the surface is ______.

Name the two broad divisions the earth's crust is divided, depending on chemical composition.

Study the figure on the right and complete the analogy:

Continents : SIAL :: ______ : SIMA

This is the densest part of the earth believed to be composed of iron and nickel which is responsible for earth's magnetism. Identify it.

Assertion (A): Sial appears to float above Sima.

Reason (R): Sial has lower density than Sima.

Which of the following is the correct order as we move towards the interior of the earth.

Which of the following is incorrect about the inner core?

At the depth of around 100-410 km, mantle is partially molten and is known as ______.

What is the temperature variation in the mantle in °C?

Name the mantle-core interface where primary seismic waves slow down and secondary seismic waves disappear completely.

Name the boundary between the crust and the mantle which has characteristics of both layers.

Assertion (A): The thickness of the lithosphere is very fragile compared to the nature and composition of the earth.

Reason (R): There are continuous changes in the earth's crust due to forces of nature.

What life sustaining unit contains only one percent of the earth's mass?

Mohorovicic discontinuity is found at about ______ beneath the oceans and ______ beneath the continents.

Extending upwards, the earth is enveloped by a blanket of gases. Name it.

The diameter of the core is about ______ km.

Name the layer of the earth that is fragile as compared to the rest of the layers of the earth. Different theories suggest that this layer undergoes changes to give earth a new shape.

In which part of the earth is NIFE found?

What is composed of NIFE?

What are the consequences of the pressure and temperature in the interior of the earth? 

How do the study of meteorites helps scientists to know about the interior of the earth?

What is the composition of the Earth’s crust?

What is the lithosphere?

Name the three layers of the earth’s interior.

Name the boundaries of three layers of the earth's interior.

Describe the mantle.

State two characteristics of the mantle.

Where is asthenosphere found?

In which form does the asthenosphere exist?

What happens to the P and S waves at the Gutenberg Discontinuity?

Why is the earth’s interior in most part found in a solid state despite great heat and pressure?

Distinguish between Core and Crust.

Differentiate between SIAL and SIMA.

Distinguish between the Gutenberg Discontinuity and Mohorovicic Discontinuity.

Describe the layers of the interior of the earth and their chemical composition.

There are two transitional zones between the two consecutive layers of the interior of the earth. Name them and state their chief characteristics.

Give a geographical reason for the following:

Temperature starts rising gradually towards the interior of the earth.

Give a geographical reason for the following:

The asthenosphere is in a semi-molten state.

Give a geographical reason for the following:

The inner core of the earth is in a solid state.

Look at the figure on the side and answer the question:

Label the parts: (1), (2), (3), (4) and (5).

Look at the figure on the side and answer the question:

 Name the state (solid, liquid or gas) in which each part exists.

Look at the figure on the side and answer the question:

Which part of the earth is suitable for human habitation? Why?

State two chief characteristics of the earth’s crust.

Which layer is responsible for earth’s magnetic field? Why?

Give a geographical reason for the following:

NIFE is so called.

Give a geographical reason for the following:

The core of the earth is the most inaccessible part of the earth.

Give a geographical reason for the following:

The earth's crust undergoes many changes.

Draw neat diagram, label them and explain. 

The interior of the earth 

The earth's crust is only one percent of earth's mass yet it is a large reservoir of resources for mankind. Justify this statement with examples.

What would happen if the earth's core no longer remain hot and the magma cools and hardens inside the earth? Give reasons to support your answer.

Suppose you were given the responsibility to explore the interior of the earth. Draw a project report describing the steps you would take, your objectives and the estimation of the costs of the project, etc.