Answer the following questions by clicking on the correct answer. Move to the next slide by clicking on the image on the correct slides. Move back to the question incorrectly answered by clicking on the try again or image on the sorry slide. The Moon's gravity pulls harder on water than on land, because water is less dense than rock. Tides are caused on the side of the Earth nearest the Moon because the Moon's gravity attracts the water. Tides are caused by the 23.5-degree tilt of the Earth's rotational axis to the ecliptic plane. Tides are caused by the difference in the force of gravity exerted by the Moon across the sphere of the Earth. The Moon’s gravity creates a tidal force that stretches Earth along the Earth-Moon line, causing Earth to bulge both toward and away from the Moon. Amazing Job, move to the next question! Remember gravity depends on mass (and distance), not on density. Try Again!! Both first and third quarters Full moon only New moon only Third quarter moon only Both new and full moons These are the spring tides, when the tidal forces of the Sun and Moon work together. Great Job, Move to next question! Remember we do not have especially low or high tides at the first and third moons. Try Again!! On the portion of Earth facing directly toward the Moon and on the portion of Earth facing directly away from the Moon Anywhere that ocean water laps upon the shore Only on the portion of the Earth facing directly toward the Moon Wherever it is currently noon These are the approximate locations of the two tidal bulges. (Approximate because Earth's rotation pulls the bulge slightly ahead of the Earth--Moon line.) Nicely Done, move to the next question!!! Try Again!! 1 2 3 4 1 and 3 2 and 4 We have spring tides - meaning the most extreme high and low tides - at both new moon and full moon. You Are a Super Star, move to next question! We actually have neap tides, not spring tides, at both first and third quarter moon and think about when spring tides occur. Try Again!! 1 2 3 4 1 and 3 2 and 4 We have spring tides - meaning both the highest high tides and the lowest low tides- at both new moon and full moon. Yeah Great Job, move to next slide!!! Remember we actually have neap tides, not spring tides, at both first and third quarter moon. Try Again!! You have reached the end of your journey in exploring tides and the force that causes them.