A Landslide is a type of mass movement that occurs when a thin block of soil, rock, and debris separates from the underlying bedrock.
Actually, this thin block of soil and rocks were held by Tree's roots so it do not separated from the bedrock. Now days, more and more trees were cutted down for modern development, and more landslides happen because of this.
A, in urban areas :)
Urban areas have bigger populations than rural ones and the Rocky Mountains have terrain that is difficult to settle on
They give us informations about our ancestors and how did they live and what did they do and than compare it to present way's of life.
I believe all of the anwers apply.
The 'fewer natural resources" is applicable assuming they are currently depleting their natural resources.