A convection current occurs - because warm air rises and cold air falls., Cold air is heavier than - warm air, Humid air is lighter than - dry air, Over a hot desert the air is - warm and dry, Over a tropical area the air is - warm and humid, A cyclone is - an area where there is low pressure air, An anticyclone is - an area where there is high pressure air, Winds always move - towards lower pressure areas, The main winds are - the Trade winds, the West Winds and the Polar Winds, Monsoons and cyclones are - periodic winds, The Mistral and Sirocco are - variable winds, Isobars - show the distribution of high and low pressure zones,

Periodic and variable winds

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