If a tree has grown out of the side of a rock cliff and a house was recently built on the land above causing the tree a lot more rain water to run off where the tree lives, it's roots have started to be exposed and are now growing faster and bigger with the increase of water. The rock eventually cracks and the tree falls down to the river.
Explain what is happening in this example using the words weathering or erosion and chemical, biological and or mechanical weathering.