The crowd in the back, not aware of what was going on at the front, continued to move forward, aided by gravity.

From here the water can flow by gravity to wherever it is needed.

Maybe it's the blood getting forced into your head by gravity that does it.

The distribution system is a low pressure hot water one operating by gravity.

In less than a month, shattered pieces pulled back together by gravity become the Moon.

There is an external force of running water (fueled by gravity).

The water flows from one bog to the next, usually by gravity.

Water could no longer flow by gravity from the land into the rivers.

She lay across the bed, her head clear off the mattress and dragged down by gravity.

Natural flows and to make the drainage of the area by gravity.