Which data is used to make a sonar map of the ocean floor?(1

sea surface-based altimetry data from satellites.

For most of the ocean, maps of bathymetry rely on sea surface-based altimetry data from satellites. However, this data is low resolution. While satellite data provide a very good map for large scale features, as of 2014, satellite data could at best resolve features of approximately 1.5 km (0.93 miles) or larger.

D. The time it takes for a pulse to bounce from the ocean floor

1. Which kind of data is used to make a sonar map of the ocean floor?

A. the amount of spreading that occurs on the ocean floor

B. the time it takes an underwater vehicle to reach the ocean floor

C. the amount of light that reaches the ocean floor

D. the time it takes for a pulse to bounce off the ocean floor

Explanation:

Echo sounding is the key method scientists use to map the seafloor today. The technique, first used by German scientists in the early 20th century, uses sound waves bounced off the ocean bottom. Echo sounders aboard ships have components called transducers that both transmit and receive sound waves.

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