How dud become an official holiday?

Agricultural practices in the united states nearly led to the extinction of the peregrine falcon during the 1950s and 60s.

What are the answers for the following questions?

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