So What? This differential heating of water and also land and also the tropics and polar regions leads come Wind!


Temperature is a measure of the energy of molecules in a substance. The name is they space the more they move.

You are watching: Caused by the uneven heating of earth and its atmosphere

The Earth’s surface ar temperature is controlled mainly by solar heating which turns on at dawn and also then turn off at sunset. Throughout the usual day the surface heats and during the night it cools. Exception to this happen during unusual wind events, where heat or cold waiting moves over the surface. Transforms in the surface temperature heat or cool the waiting above, which leads to air activity (wind).

The sun gives a remarkable steady flow of energy, sometimes called the solar constant by scientists, to the outer atmosphere. This flow is absorbed, transmitted and also scattered by the setting below, and then the sent part gets reflected, took in or scattered.

The Earth’s surface is about 71% water and also 29% land. There are big differences in way the sunlight heats water and land. Water has a greater (~4x) warmth capacity, which is the amount of warmth (measured in calories) compelled to adjust the temperature by one level (Celsius). Water surface ar temperature adjust much much less rapidly than land--so land areas are often hotter 보다 the nearby ocean during the day, and also cooler throughout the night.


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Solar heating of the Earth’s surface is uneven because land heats faster than water, and also this reasons air come warm, expand and rise over land while the cools and also sinks end the cooler water surfaces.

Solar warming is generally greater in ~ the equator wherein the sunlight shines directly and also much much less at the poles whereby the sun is low in the sky. Surface that room perpendicular come the sun’s ray course heat much faster than those in ~ an angle. This differential heating is pass on to the air over by conduction which causes air expansion and changes in pressure. Wind is the an outcome of pressure alters in the atmosphere. Any type of shoreline is a wind machine, because of solar heating effects.

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Over the totality year, polar areas are cold or cool and also the tropics are warm or hot. Air moves since of these differences as it is broadens where the hot and also contracts where it’s cold. Winds blow from high pressure locations to low press ones.