9th Geography chapter1

Answer in brief:

1. Write a brief note on the various spheres of the Earth.

Various spheres of the Earth:

1.The Lithosphere is the solid outer part of the Earth.

2.The Hydrosphere is the watery part of the Earth's surface including oceans, rivers, lakes and water vapour.

3.The Atomsphere is a thin layer of gases that surrounds the earth.

4.The Biosphere is the layer of Earth where life exists.

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2. Mention the layers of the interior of the Earth.

1.The crust

2.The mantle

3.The core

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3. Define Plate tectonics.

Tectonic Plates:

1.Tectonic plates in Lithosphere are divided into major and minor plates. 

2.These plates float over the mantle.

3.The movement of tectonic plates is due to thermal energy from the mantle. 

4 Collisions of these plates produce mountain ranges and irregular surfaces

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4. What is Tsunami?

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5. What is a Volcano? Mention its major components.

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6. What is an Earthquake and how it occurs?

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7. What are seismic waves and mention its types?

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8. Write about the Pacific Ring of fire.

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Distinguish between

1. Core and crust.

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2. Epicentre and Hypocentre

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3. Divergent and convergent boundaries.

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4. Primary waves and Secondary waves.

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5. Shield volcano and volcanic Dome.

Volcanic dome

Shield volcano 

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Write answers in a Paragraph

1. Describe the structure of the Earth.

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2. Write a note on the internal and external 

processes of Earth.

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3. How are volcanoes classified based on the periodicity of their eruptions?

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4. Explain the effects of Volcanoes.

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