4. Determine the map below shows
coastlines of the southeastern U.S. at three
times during the Cenozoic era. Which
choice represents the coastline at the height
of the Pleistocene ice age? Explain your
reasoning.
Choice A
Choice B
Choice C
A is correct because, during an ice age, sea levels lower as a result of more water being engulfed in ice sheets and glaciers. When sea levels shrink, coastlines are extended.
