For nearly 40 years, the definitive and only map of the ocean seafloor was the hand drawn 1977 World Ocean Floor Map created by Bruce Heezen and Marie Tharp:
Well, we now have a new map that shows the composition of the seafloor and is interactive as well. The 1977 World Ocean Floor Map shows the topography but not what the seafloor is actually made of.
This map was created by Geoscientists from the University of Sydney based on 15,000 samples of the seafloor that were taken and their data recorded by various research ships over the last 50 years.
With the the help of data experts at the National ICT Australia (NICTA), the numbers were crunched and this beautiful map was created.
The map shows that the main composition of the seafloor is calcareous ooze (blue) and clay (brown). Calcareous ooze is made up of the hard calcium-rich shells of plankton that are deposited on the ocean floor when these creatures die. Over time these shells build up and mix with clay and silt to form this mud like substance.earth without oceans-earth maps without the sea-without sea earth map-