What is the difference between formal and functional regions?

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

In an effort to japan recover from the devastating effects of the 1929 depression, japanese military leaders in the 1930s formed an alliance with nazi germany negotiated more trade treaties with the soviet union closed its doors to western trade adopted a policy of imperialist expansion

Acanyon on the ocean floor at which the crust bends downward is called a(n)