In the passage, what does David Sandwell state the
main problem is with radar, lidar, and sonar
technology?
A. There are often ocean depth's where the radar
and lidar systems cannot penetrate.
B. There are satellite mapping techniques that
aren't nearly as accurate as radar, lidar and
sonar.
C There are often areas of the ocean that are
mapped completely, but in too great of detail.
OD There are often areas of the ocean where coral
reefs grow too thickly for them to see clearly.
