Final answer:
Saturn's rings are made up of water ice particles that range in size from grains of sand to house-sized boulders. The rings are broad and thin, with an average thickness of 20 meters.
Step-by-step explanation:
The rings of Saturn are composed primarily of water ice particles. These particles range in size from grains the size of sand up to house-sized boulders. The rings are very broad and thin, with an average thickness of only 20 meters. They are made up of a collection of icy fragments that orbit the equator of Saturn.