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)

In the diagram below dab and dac are adjacent angles

Tides are caused by a differences in the gravitational force of the sun at different points on earth. differences in the gravitational force of the moon at different points on earth differences in earth’s gravitational field strength at different points on earth’s surfac fluctuations in the gravitational attraction between earth and the moon.

What empire controlled most of the middle east except for a few years between 1516 and 1917, where was the capital of this empire located and what was the geographic extent of this empire?