They abraded the rocks, revealing fresh surfaces that contain distinct rounded carbonate grains, a sign of settling in a lakefront.

In other words, they investigated questions such as: What happens when these materials are abraded or burnt?

One recent study suggests that many particles enter the water when you repeatedly open or close the cap, and tiny bits abrade.

Despite the dirt, the stains and the splitting, there’s little loss of paint — which sometimes abrades with rolling and unrolling.

When tyres make contact with the road, tiny particles are abraded and emitted.