an example of a(n) air mass is a polar air mass that forms over the northern antlantic ocean (fill in the blank)

Using complete sentences, explain the differences between a command economy and a market economy. what type of economic system is created when these two systems are combined? what are the benefits of combining these two systems?

What is unusual about the iraq mountains ,in spite of their old age?

Identify the youngest layer in the figure ( have to click one letter)