Each person in the United States uses of water each day. A. two farthings
B. over 80 gallons
C. 100 acre-feet
D. a sheep's stomach​

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.