In order to prevent the expansion of deserts, trees are planted in strips or blocks with the shortest trees on the desert side and tallest on the other side. Such plantation is called?

Question: In order to prevent the expansion of deserts, trees are planted in strips or blocks with the shortest trees on the desert side and tallest on the other side. Such plantation is called?
(1) shelter belts 
(2) agroforests
(3) wind breaks 
(4) social forests

Answer: (3) wind breaks 
A windbreak or shelterbelt is a plantation usually made up of one or more rows of trees or shrubs
planted in such a manner as to provide shelter from the wind and to protect soil from erosion. They are
commonly planted around the edges of fields on farms. If designed properly, windbreaks around a home can reduce the cost of heating and cooling and save energy. Windbreaks are also planted to help keep snow from drifting onto roadways and even yards. Other benefits include providing habitat for wildlife and in some regions the trees are harvested for wood products.

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