What is a map key ? what does a map key do?

Many areas surrounding the caspian sea contain important a. rare minerals b. forestry resources c. gold and silver mines d. oil and natural gas fields

Afootpath is to be constructed in a park in the shape of a parallelogram. when a coordinate plane is laid over a map of the park, the vertices of the footpath are (-4,2) (8,2) (11,7) and (-1,7). what is the perimeter of this path

Which is not a cash crop grown in the high islands of melanesia and polynesia? d. rubber c. coffee b. sugar cane a. kiwifruit