Simplify the following text for a Grade 11 native English-speaking person.
Original: Finely ground marble powder is a component in paints , toothpaste , and plastics ; calcium carbonate can also be reduced under high heat to calcium oxide ( also known as `` lime '' ) , which has many applications including being a primary component of most cements .
Simplified: Finely ground marble or calcium carbonate powder is a component in paper , and in consumer products such as toothpaste , plastics , and paints .