Terrain

Terrain
Terrain is the term used to refer to naturally occurring structures, such as trees an rocks. Unlike most structures, terrain won't generate any resources for your community. They also cost credits to dig up or move, as well as credits and resources to build and place.

This means that - while annoying - terrain is often best left alone, in order to decrease your spending. If possible, try to structure your community around the terrain rather than demolishing everything.

As mentioned, terrain can be placed at a small cost. This isn't necessarily helpful when it comes to completing levels, but goes a long way to making your community look great!