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A sheath of tissue that encloses the vital organs of a mollusk, makes the mollusk's shell, and performs respiration.[1]

A zone in the Earth's interior between the crust and the core that is 2,900 kilometers (1,740 miles) thick. (The lithosphere is composed of the topmost 65-70 kilometers (39–42 miles) of mantle and the crust).[2]


  1. Wile, Dr. Jay L. Exploring Creation With Biology. Apologia Educational Ministries, Inc. 1998
  2. Glossary of Volcano and Related Terminology