What are the characteristics of continental tropical air masses?

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

When the soviets created the borders of their central asian and caucus republics, the paid little attention to where each region’s ethic group lived. ethnic-related disputes exist along every sherd boundary in central asia. true false

What way does renewable energy differ from nonrenewable energy?