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How has the ocean bed been measured?
The Seasat satellite was able to measure variations in the height of the sea bed using radar. It built up a picture of the average surface level of the sea by measuring the reflection time of radar waves off the sea's surface. A surface level above average indicated a steep slope on the sea bed.
In three months, the Seasat satellite plotted the heights of more than 50 million locations.
In three months, the Seasat satellite plotted the heights of more than 50 million locations.
 
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