Purnima Lallan Sharma Foundation · Est. 2021
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Air, monsoon, climate and coasts

Follow the forces moving air and sea, interpret rainfall and compare climate records with clear baselines.

4 lessons · Learn at your own pace

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Low cloud partly hides green wooded hills in the Western Ghats, Karnataka.
Monsoon cloud over the Western Ghats at Bettada Bhyraveshwara, near Sakleshpur, Karnataka. · Rakdept · CC BY-SA 4.0

Learn, practise, explain

Try the exercise before reading its explanation. Answer the self-check questions in your own words, then compare your reasoning with the answers. Revisit any difficult section before moving on. No account or payment is needed.

  1. 01

    Atmosphere, pressure and the causes of wind

    Wind is moving matter responding to forces. Connect invisible molecular collisions, the weight of an air column, unequal heating and Earth’s rotation to the arrows on a weather map.

    Learning outcome: Explain pressure changes with height, compare pressure gradients and use a sea-breeze model without assuming every wind flows straight across a map.

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  2. 02

    Indian monsoon: circulation, moisture and rainfall patterns

    The monsoon is a seasonal circulation system, not a single rain cloud moving across India. Understand its moisture supply, shifting rain-bearing systems and why a seasonal total can hide very different local experiences.

    Learning outcome: Explain the circulation beyond a giant sea breeze, distinguish onset from one shower and interpret timing and area-weighted rainfall using explicit denominators.

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  3. 03

    Weather, climate and reading trends in data

    One cool afternoon does not settle a climate question, and a smooth graph does not remove uncertainty. Learn how reference periods, consistent measurements and careful averaging turn records into interpretable evidence.

    Learning outcome: Calculate temperature anomalies and changes between period means, identify measurement artefacts and distinguish an observed trend from a forecast or causal explanation.

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  4. 04

    Oceans, tides and changing coasts

    A coast is a meeting place of moving water, sediment and land. Distinguish waves, currents and tides, then use two paper records to explain why a water level and a beach shape can change for different reasons.

    Learning outcome: Explain these mechanisms, calculate tidal range using a common reference, and balance a coastal sediment account while recognising the limits of a short record.

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