Fact 1: Carbon may be stored in sedimentary rock for millions of years. Fact 2: Limestone is a type of sedimentary rock. Given the two facts above, what element can be stored in limestone for millions of years?
Available options: (A). oxygen. (B). Energy. (C). matter. (D). carbon. (E). sodium. (F). helium. (G). rock salt. (H). heat.
Answer:
(D).