Which period represents the last two million years of geologic time?

Exploration mission 2;

D. coal i hope that

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

Each meridian forms half of a great circle, assuming a spherical earth. meridians intersect lines of latitude (parallels) at right angles. the spherical earth is divided into  360 degrees   east-west. lines of longitude range from 0° to  180° to the east and from 0° to -180 ° to the west of the prime meridian.