Anoxia, or a lack of oxygen in bodies of water, leads to a. unsafe drinking water b. dead zones c. global warming d. algae blooms

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4

Describe the four major spheres of the earth system; identify the parts of the earth they each represent. explain what is meant by the "earth system."

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