The earths crust is moved rather than pulled by things called convection currents. This is when heated rock from the earths core rises up and reaches the crust where it cools. It then sinks down again and carries on in a circle which moves the crust
the trees, plants on the earth & the earths crust. The earths crust is 28.5% Oxygen, so when Trees & plants grow the oxygen from the crust will lead into the plants, which will start the cycle of Respiration & Photosynthesis.