Which of the following statements about time zones is true? a. time zones are based on the days of the week. b. time zones sometimes follow the borders of countries. c. time zones’ boundaries are perfectly vertical lines (north to south). d. time zones’ boundaries are perfectly horizontal lines (east to west).

Atown is built on the banks of a small lake on the edge of a desert. after some time, the townspeople discover that water from the lake has become too polluted to use. describe one way that the lake may have been contaminated by the actions of the townspeople, and explain how the townspeople can remediate this problem.

The causes of the failure of the league of nations

In wegener’s evidence for continental drift, continents were proposed to fit together, such as the east coast of south america with the west coast of europe. east coast of africa. west coast of greenland. lower west coast of africa.