Varying between 0 to 100mm per year, the movement of a plate is driven by convection in the underlying hot and viscous mantle. Earthquakes, volcanic activity, mountain-building, and oceanic trench formation occur along plate boundaries in zones that may be anything from a few kilometres to a few hundred kilometres wide. To watch a simulated fly-by along New Zealand's plate boundary check out this video.
The average business card size in cm (centimeters) is 8.9 x 5.1. In inches this is 3.5 x 2. In millimeters (mm) the size will be 88.9 x 50.8. Measurements are usually given in inches or millimeters.
From design point of view - we always set business cards to 85mm x 55mm as someone mentioned above. This is the same as a standard credit card size. I do know of some people who design to 88 x 55mm though so it doesn't matter too much - as long as it fits in a card holder or wallet then it'll be fine! Cheers.