If you were dying of thirst which river would you drink from a V shaped valley or a U shaped river

According to the earth science reference tables, during which geologic time period were the continents of north america, south america, and africa closest together?

Which of the timelines above accurately represents the order of historical events in canadian history? a. one (1) b. two (2) c. three (3) d. four (4)

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.