First Map Of The Ocean Floor
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Today we know more about the topography of the moon and mars than we do about our own planet s sea floor.
First map of the ocean floor. The publication of heezen and tharp s physiographic map of the north atlantic in 1957 was the first map of the sea floor that enabled the general public to begin to visualize what the ocean floor really looked like. This is expensive and time consuming so sonar maps are mostly only made of places where ships spend the most time. To complete a map of earth s ocean floor you ve got to take to the high seas by boat. Typically finely wrought ocean maps have been the result of extensive sonar.
We ve come a long way in ocean exploration since the days of the hms challenger launched in 1858. Each consist of three sheets a base bathymetric map. But in the 1950s and 60s when this feat of cartography was being assembled by us cartographers marie tharp and bruce heezen we knew almost nothing. Revealed to the world in 1977 this is the first map of the earth s ocean floor.
The following features are shown at example depths to scale though each feature has a considerable range at which it may occur. This graphic shows several ocean floor features on a scale from 0 35 000 feet below sea level. These early maps based on hundreds of thousands of hand picked depths provided the context for the plate tectonics revolution.
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