Acid rain threatens the world's food supply.
Acid rain is a global issue.
Answer:
the moon infront of sun
Explanation:
the moon moves infront of the sun very slowly and that how it interact the phases
Non-price rationing system is commonly done by queuing (to resolve rationing problems brought by price ceilings) and by coupons (to restore buyer equilibrium). Favored customers who received special treatment from dealers when there is an excess demand, which means: owners giving goods and services to their friends, is another non-price rationing mechanism.
