Geography study notes

Cumulus Clouds -Clouds with a flat horizontal base, massive, rounded and less horizontal extent.

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Nimbus Clouds -are dark at the base and sometimes white at the sides and cause rain and thunderstorms. Convectional Rainfall Type of rainfall common near large water bodies formed as a result of convective rising and cooling of moist air. Atmospheric pressure Factors Influencing Atmospheric Pressure 1.

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Frontal cooling-cooling of warm air mass when it blows towards a cold air mass. Sleet -Precipitation which is a mixture of rain and snow. Forests and Water Bodies Areas near forests and large water bodies experience higher rainfall and more often due to high rate of evaporation.

When fog mixes with smoke its called smog. Orographic cooling-cooling of moist air as it climbs a hill or mountain.

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Humidity Factors Influencing Humidity 1. Types of rainfall 1. Kalahari and Namib deserts.

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Snow Solid precipitation formed when tiny water droplets freeze and form ice crystals. This is the cause of western margin deserts e. Fog is denser than mist i. E Trade Winds converge. Also the rays of the sun strike the earth at right angles hence solar energy is concentrated over a small area. The droplets join to form clouds. The high pressure areas have descending dry air. Sleet -Precipitation which is a mixture of rain and snow.

Affects rain formation in such as way that places with high humidity are likely to experience higher rainfall than those with low humidity. Air Masses - Distinct large parcels of air moving in one direction - Originate from areas of uniform weather and topography from where they derive their characteristics e.

Atmospheric pressure Factors Influencing Atmospheric Pressure 1.

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Geography Revision Notes