Why did early farmers use slash-and-burn agriculture?
a. to get rid of pests
b. to get rid of old crops
c. to keep the soil fertile
d. to keep undergrowth from drying out the earth

Which of these did the soviet union do in 1961? it built a wall through berlin to keep people from moving to the west. it used force to destroy a wall the united states had built in berlin. it convinced the british and french to merge their zones in berlin with the soviet zone. it threatened to bomb berlin if the united states did not leave within 30 days.