Describe the effect on the heights of earth’s high and low tides when the moon moves from position d to position a.

Well, something that will hhelp you see the effect on the heights of earths hicch and low tides is the fact that  the Moon's gravitational forces are strong enough to disrupt the balance of the waters by accelerating the water towards the Moon. As the Moon orbits our planet and as the Earth rotates, the waters of the earth also moves. So, in some areas, like in the D position, the waters are in high tides and in the A part will be low tides. 

The reason why i feel that the theory of plate tectonics is correct because scientists have found dinosaur bones of the same species in africa, asia, and in the americas. which means that they must have been together at one point in time. plate tectonics is also how the hawaiian islands were formed. as the plate hawaii is on was moving north west, magma would melt through the sea bottom and hardening. forming into the island chain. plate tectonics also explains the mariana trench. two plates were moving away from each other and made a giant crack in the ocean floor running 2,550 kilometers (1,500 miles)  long.

Ibelive it  is a yazoo tributary