Let's think step by step! What element can be stored in limestone for millions of years?\nOptions:\n- (A) oxygen\n- (B) Energy\n- (C) matter\n- (D) carbon\n- (E) sodium\n- (F) helium\n- (G) rock salt\n- (H) heat
The thinking starts now:
User
Carbon may be stored in sedimentary rock for millions of years. Limestone is a type of sedimentary rock. Carbon may be stored in limestone for millions of years. The final answer: (D).
Assistant