After moving over the gill margins, particles reach the mouth of the bivalve.

When breathed in, these particles can reach the deepest regions of the lungs.

Such particles reach Earth from every direction of the sky.

When the particles reach the earth, they are channeled by the planet's magnetic field into the polar regions.

When the particles have reached their maximum energy, they are steered out of the synchrotron and aimed at a target.

Conversely, light particles stay towards the outside of the spiral, with the water, and quickly reach the bottom.

So far these flaky particles had not reached towards the two they confined.

In the collision step, collision rules are used to determine what happens if multiple particles reach the same site.

Each time an alpha particle reached the screen it produced a flash.

Eventually these particles reach a certain size where they are too large to stay suspended in the solution and precipitate out.