関連ワード:
three major rock types that make up the earth's crust three major rock types that make up the earth 3 major rock types that make up the earth's crust list three major rock types that make up the earth's crust list three major rock types that make up the earth list 3 major rock types that make up the earth's crust the three main types of rocks that make up the earth's landscape three basic rock types what three types of rocks are there
