Waterfall. <span>As the river or stream wears away the weak rocks, they travel across the surface of stronger rocks. These more resistant rocks become the capstones to waterfalls. The number and thickness of these stronger rock units in a vertical sequence of rocks controls how many water falls there are and how much vertical drop there is on each waterfall.</span>
When any state or country operates with a "command economy", this means that the government, instead of the "free market" or consumers, is in charge of determining output and production quotas.
Cesar Chavez led the successful boycotts of fruits and vegetables to put pressure on California growers to sign union contracts.
