How much more can the Virgin River cut down before it hits bottom or reaches base level in Zion National Park? 500 ft 1000 ft 100 ft 5000 ft

The scientist can conclude that there is a decrease in the natural resources due to human activities. because of innovation and modernization of the environment, then there goes pollution and other bad effects that destroys the natural resources.

Ibelieve it would be religious 

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

Economy is the answer