Which of the following best describes the origin of ocean tides on Earth?
A. Tides are caused by the difference in the force of gravity exerted by the Moon across the sphere of Earth.
B. The Moon's gravity pulls harder on water than on land, because water is less dense than rock.
C. Tides are caused by the 23.5-degree tilt of the Earth's rotational axis to the ecliptic plane.
D. Tides are caused on the side of the Earth nearest the Moon because the Moon's gravity attracts the water.
Answer:A
Which of the following best describes the origin of ocean tides on Earth?
A. Tides are caused by the difference in the force of gravity exerted by the Moon across the sphere of Earth. B. The Moon's gravity pulls harder on water than on land, because water is less dense than rock. C. Tides are caused by the 23.5-degree tilt of the Earth's rotational axis to the ecliptic plane. D. Tides are caused on the side of the Earth nearest the Moon because the Moon's gravity attracts the water.