Cool, dry air sinks. The clash of moist, warm air and polar cold fronts produces rain. Cell 2 North Pole north Some of the cool, dry air sinks and is then deflected Tundra Boreal forest 60° Grassland both north and south. Desert 30° Deciduous forost Cell 1 north O° Equator Tropical rainforest Cell 1 Deciduous forest south Warm, moist air cools as it rises, causing rainfall. 30° Desert 60° Grassland Tundra South Cell 2 south Warm, moist air rises; rain falls. Pole Cold, dry air sinks.

Cool, dry air sinks. The clash of moist, warm air and polar cold fronts produces rain. Cell 2 North Pole north Some of the cool, dry air sinks and is then deflected Tundra Boreal forest 60° Grassland both north and south. Desert 30° Deciduous forost Cell 1 north O° Equator Tropical rainforest Cell 1 Deciduous forest south Warm, moist air cools as it rises, causing rainfall. 30° Desert 60° Grassland Tundra South Cell 2 south Warm, moist air rises; rain falls. Pole Cold, dry air sinks.