UESTION 12 Which of the following best describes the difference between a source and a mouth? A source is where a river or stream originates, and a mouth is where it empties into another body of water. A source is where a river or stream empties into another body of water, and a mouth is where it originates. A source is partially surrounded by land, and a mouth is completely surrounded by land. A source is completely surrounded by land, and a mouth is partially surrounded by lan