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Q1: Which kind of climate would need most irrigation: dry and hot; warm and wet; hot and wet; dry and cold?

[Answer]

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...for irrigation

In some parts of the world crops could not be grown without additional water. Adding water to fields is called irrigation.

In hot, dry countries, irrigation, using river water, is the largest user of water - far more than that used for supplying homes.

Most irrigation is needed in the early summer when plants are growing fast.