Gravity is a force that attracts objects together. For the pull of gravity between two objects to be noticeable,
A.
one of the objects must be made of metal.
B.
the objects must have opposite charges.
C.
at least one of the objects must be very large.
D.
special glasses must be used.

When does a spring tide occur? question 9 options: they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur twice a year in the spring and fall. they occur on the date of the vernal equinox each year, no matter what stage the moon is in. this is why they are called spring tides. they occur when the sun, moon, and earth are at 45-degree angles from each other. this happens once every spring. they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur all year long.