Outline TWO changes that take place from the primary economic sector up to the quaternary sector.

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?

Explain how a convection current in the earth is formed.

Can someone me? i need to have this done as soon as possible! i'm putting 20 points on this!