medium difficulty5 min

Local and Planetary Winds

Local winds are winds that affect a small area and change over short periods, while planetary winds are large-scale wind belts formed by global pressure patterns and Earth’s rotation.

In one line: Sea breeze comes from sea; land breeze comes from land.

Practice This Concept

Understand it

Sea breeze and land breeze are local winds caused by different heating rates of land and water. Planetary winds such as trade winds and westerlies are part of global circulation and affect large regions for long periods.

Example

During daytime near a coast, sea breeze blows from sea to land; at night, land breeze often blows from land to sea.

Rule to remember

Rule: local breeze direction depends on unequal heating and cooling of land and water; air moves from high pressure to low pressure.

See it worked out

Follow the example line by line, then use the same method on new questions.

Worked example

1At 2 p.m., sand on a beach becomes hotter than seawater.
2Air over land rises, so cooler sea air moves inland as sea breeze.

Method you can reuse

Identify time of day, compare heating of land and sea, mark pressure regions, then draw wind arrows from high to low pressure.

Sketch it in your answer

Draw two coastal diagrams: day with arrows sea to land, night with arrows land to sea; label warm surface, cool surface, high pressure, and low pressure.

Check yourself

Answer the question in your head before opening the answer.

Try it yourself

How is sea breeze different from land breeze?

Think first, then show answer

Sea breeze blows from sea to land during the day because land heats faster and forms low pressure. Land breeze blows from land to sea at night because land cools faster and becomes relatively high pressure.

Common wrong answer

Sea breeze blows from land to sea because land is near the sea.

Why it loses marks: Sea breeze is named for the direction from which the wind comes.

Don't mix this up

Students often interchange sea breeze and land breeze directions. Sea breeze occurs when land is warmer in the day; land breeze occurs when land cools faster at night.

Exam tip

For breeze questions, first identify day or night, then decide which surface is warmer and where low pressure forms.

Write it in the exam

Each point is worth about one mark. Write point 1 for a 1-mark question and keep adding points as the marks go up.

How CBSE asks it

Exam questions often ask for labelled diagrams of sea breeze and land breeze or comparison between local and planetary winds.

1
Enough for 1 mark
Local winds are winds that affect a small area and change over short periods, while planetary winds are large-scale wind belts formed by global pressure patterns and Earth’s rotation.
2
Add for 2 marks
Example: During daytime near a coast, sea breeze blows from sea to land; at night, land breeze often blows from land to sea.
3
Add for 3 marks
Sea breeze and land breeze are local winds caused by different heating rates of land and water.

MCQ Quiz

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