UnScramble this Word: y a a p n t m?

Questions

Science - What is the scientific name for earth's outer layer of surface soil or crust?

Science - What is the study of prehistoric plants and animals?

Science - What is the study of the composition of substances and the changes they undergo?

Science - What is the study of the earth's physical divisions termed?

Science - What is the term that refers to the search for the existence of ghosts?