What does orbiting satellite provide geographers with?

Sonar is an application of the doppler effect used by submarines.  this test was on k12.

When a lake, river or other aquatic  system  becomes  eutrophic, it can have serious negative effects on other organisms like fish, birds and even people.if an algal bloom is so bad that it causes wide-spread death  in  the  water, the organisms that die will all sink to the bottom and start to decompose.

It would be d.hope this plz give brainliest!