Earthquake exhibition

Yesterday I went to the museum to see the Christchurch Earthquake exhibition.  Something interesting I learnt was that in 1881 the Christchurch cathedral cross fell down.I would have not liked to be in the Christchurch earthquake because everyone would be petrified and hurt.
One question is that I have is why do tectonic plates move?

Term 1s achievment

Each and every-one has made their goal. We are focusing on one thing. In Term 1 we focused on managing ourselves.