Question

what uses radar data from satellites and assists in mapping changes in the surface of the ocean?
sonar
magnetic imaging
x - ray
radar altimetry

Explanation:

• Sonar uses sound waves, not radar data.
• Magnetic imaging focuses on magnetic fields, not ocean surface mapping with radar.
• X - ray is not used for this purpose (used in medical and some material analysis).
• Radar altimetry specifically uses radar data from satellites to measure the height of the ocean surface and map its changes.

Answer:

radar altimetry