UPSC Prelims Special – Geography Synopsis | English | Page 3

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1. Oceans and Ocean Relief Features

Oceans cover nearly 71% of the Earth’s surface and play a major role in climate regulation, trade, and biodiversity.

Major Oceans of the World

• Pacific Ocean
• Atlantic Ocean
• Indian Ocean
• Arctic Ocean
• Southern Ocean

Ocean Relief Features

• Continental Shelf
• Continental Slope
• Deep Sea Plains
• Ocean Trenches

The Pacific Ocean is the largest ocean in the world.

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2. Ocean Currents

Ocean currents are continuous movements of ocean water influenced by winds, Earth’s rotation, temperature, and salinity.

Types of Ocean Currents

• Warm Ocean Currents
• Cold Ocean Currents

Important Ocean Currents

• Gulf Stream
• Labrador Current
• Kuroshio Current
• Canary Current

Warm currents increase coastal temperatures while cold currents reduce them.

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3. Tides and Waves

Tides are periodic rises and falls in sea levels caused mainly by the gravitational pull of the Moon and the Sun.

Types of Tides

• High Tide
• Low Tide
• Spring Tide
• Neap Tide

Importance of Tides

• Navigation support
• Fishing activities
• Tidal energy generation

Spring tides occur during full moon and new moon phases.

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4. Indian Monsoon System

The Indian monsoon is a seasonal wind system that plays a major role in agriculture, economy, and climate of India.

Types of Monsoon

• Southwest Monsoon
• Northeast Monsoon

Factors Influencing Monsoon

• Differential heating of land and sea
• Pressure differences
• Jet streams
• El Niño effect

Southwest Monsoon provides most of India’s annual rainfall.

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5. Soil Types in India

India has diverse soil types suitable for different agricultural activities and climatic conditions.

Major Soil Types

• Alluvial Soil
• Black Soil
• Red Soil
• Laterite Soil
• Mountain Soil

Black Soil is ideal for cotton cultivation.

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Quick Revision Points

• Pacific Ocean – Largest ocean
• Gulf Stream – Warm current
• Spring Tide – Full moon tide
• Southwest Monsoon – Major rainfall source
• Black Soil – Cotton cultivation

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Practice MCQ

Which soil is most suitable for cotton cultivation in India?

• A) Red Soil
• B) Black Soil
• C) Laterite Soil
• D) Mountain Soil

Correct Answer: B) Black Soil

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