The place where a river begins Source The business of growing crops and raising animals (farming) Agriculture A crop that is grown to be sold for money rather than to be used on a farm where it is grown Cash crop $$$$$ A mineral found under Earth’s surface that is burned as a fuel Coal Land formed by the soil that a river deposits as it flows into a large body of water Delta The time of the year when the weather is warm enough for crops to grow in a certain place Growing season and The use of ditches or pipes to bring water to fields Irrigation A group of workers organized to get better working conditions Labor union The place where a river empties into an ocean, a lake, or a larger river Mouth A place where ships load and unload their goods Port All the land that is drained by a river and its tributaries River basin A person traveling on vacation Tourist Any river that flows into another larger river Tributary