Question

Data collected by the drilling ship Glomar Challenger confirmed that _____.


most of the ocean floor is more than 180 million years old


the ocean floor’s surface is smooth


the ocean floor is not spreading


none of the ocean floor is more than about 180 million years old

Answer 1

Data collected by the drilling ship Glomar Challenger confirmed that **none of the ocean floor is more than about 180 million years old**. This finding supported the theory of seafloor spreading, indicating that the ocean floor is constantly being renewed and younger than the continents.