Question

state the reason for the differential heating of land and water

Answer 1

Solar heating of the Earth's surface is uneven because land heats faster than water, and this causes air to warm, expand and rise over land while it cools and sinks over the cooler water surfaces. 

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Answer 2

Land gets heated faster as compared to water and cools faster. Hence temperature contrasts arr great over the landmasses, but only moderate over seas