Tides, such as those along the coast of Massachusetts, are caused by gravitational
attractions acting on Earth. Why is the
gravitational attraction of the Moon a greater
factor in determining tides than the gravitational
attraction of the much larger Sun?
A Earth is much closer to the Moon than to the
Sun.
B.
The Sun's gravity is a factor only during the
day.
C. The Moon's core has a much greater density
than the Sun's core.
D. The Sun's mass is smaller than the mass of
the Moon.

the correct answers are:

a - pacific plate;

it is the biggest oceanic tectonic plate. surrounded on all sides by continental tectonic plates, it is submerging and gradually becoming smaller and smaller.

b - north american plate;

huge continental plate, occupying big portion of the northern hemisphere.

c -eurasian plate;

alongside the north american plate, it is one of the two dominant continental plates in the northern hemisphere.

d - indian plate;

a small continental plate, that has been part of gondwanaland initially, but after the break up of it, moved towards northeast and pushed into the eurasian plate that was once part of laurasia.