a sinking or currving of a area of land.
subsidence can happen anywhere, but it mostly happens in south London. subsidence is also an issue in league city.
subsidence is caused by large trees sucking water out of the ground and pumping water and oil out of the ground.
Negative effects on the enviorment
1.) avoid putting large trees next to buildings and houses
2.) replace the water pumped out of the ground with soil (my solution)