The separation process uses a metal drum, too, that the mixed particles fall onto.

Smaller particles can fall into the spaces underneath a larger particle after each shake.

A second particle, placed on the inner slope, fell straight into the well.

And still larger particles would have fallen on the keyboard.

He felt crumbling particles fall away from his fingertips.

They can't be very old, their particles will fall into the planet in a matter of a few million years.

After striking the wall, these particles fall into a hopper located underneath.

They provide a very large surface area onto which particles may fall and become stabilized.

As a result, all elementary particles fall in representations of this group.

Little particles trickled off and fell into the hole beneath.