Why is ocean water gravitated by the Moon and sand is not?

The moon’s gravity pulls on earth’s sand and water just the same. However, water, being a liquid, can easily move, and thus we have tides. Sand is not a liquid, and doesn’t move as easily. read more

This, they often say, leads to a gravitational imbalance, which stretches the ocean into two opposing bulges: one that's closest to the Moon (where the Moon's gravity is strongest); and one on the opposite side from the Moon (where its gravity is weakest). read more

While water evaporates from the ocean, the salt gets left behind. Also, rivers drain into the oceans, bringing in additional ions from rock that was eroded by rainwater and streams. The saltiness of the ocean, or its salinity, is fairly stable at about 35 parts per thousand. read more