The answer would be conservative plate boundaries.
They occur where plates slide past each other in opposite directions, or in the same direction but at different speeds. Friction is eventually overcome and the plates slip past in a sudden movement. The shockwaves created produce an earthquake.
I hope this helped and is correct! :)
Answer:
There is 3 because K2 is its own atom and it has 2 K2 and Co3 is its own and there's one
Explanation:
This is what I was taught