CK-12 Foundation
Ck 12: Plix: Bathymetric Evidence for Seafloor Spreading
[Free Registration/Login Required] A site where students can label the features of the ocean floor such as: mid-ocean ridge, rift, and more. Also on the site is a short quiz about the different topography of the ocean floor.
CK-12 Foundation
Ck 12: Earth Science: Bathymetric Evidence for Seafloor Spreading
[Free Registration/Login may be required to access all resource tools.] Describes features of the seafloor and how they are mapped by echo sounding. It touches upon the continental margin as well.