I build huge cans of learning named after a small pink water animal with lots of legs.

I build huge cans of learning named after a small pink water animal with lots of legs. The can of learning fires the tiniest bits of air, hurried up by a field, at rocks to break them into the tiniest bits of matter. We suck all of the air out of the box, leaving only empty space. That way the bits of the rock don't hit bits of air that are in the way.

Another field sucks these bits off of the face of the rock, and into a big box filled with empty space and more fields.  The fields in the box sort the bits by exactly how heavy they are. The force that holds the bits together makes them a little bit lighter, so knowing exactly how heavy they are lets us tell tiny bits holding on to each other from single other tiny bits that are slightly lighter or heavier.
The very heavy bits are actually too big to hold themselves together. So they fall into pieces over time.  We look at how many pieces there are. This tells us the age of the rock.
People wonder how old rocks are.  My business builds cans of learning to tell them.

Brief: Explain your technical job using only the 1000 most common words #upgoerfive

Thanks to Anne and Chris for the brief.