where people grind each other while dancing
tetoic plates grind the grind a slip past each other
they grind past each other
Friction
So the vertebrae in your spine will not grind agaist each other.
Earthquakes
Regional
When tectonic plates move and grind against each other, this is an earthquake. If the moving of tectonic plates were to occur beneath the ocean's surface, the result would be a tsunami.
i dont know lol sorry
No. There is no contact if you have clothes are so you are safe with that.
Yes, they have to have teeth opposite each other to allow them to grind their food.
Earthquakes are caused when this happens.