Help me with 4 , 5 , 6, and 7 please

Which feature of a map shows the relationship between a distance on a map and that distance on earth? key scale grid system compass rose

Which of the layers of the earth has the following three characteristics? i. it is a solid outer layer. ii. it is between 3 and 30 miles thick. iii. it is separated into plates. a. the outer core b. the inner core c. the mantle d. the crust

What are some of the impacts of humans on the earth?