

Human: Why are roads made out of asphalt instead of something else such as rubber?

Assistant: It’s hard to know why, exactly.  There are several hypotheses though, and here’s one that makes sense to me:  
Asphalt is an aggregate of fine rock powder called asphaltite and it’s the durable qualities of asphaltite that make asphalt strong.


Human: Why are roads made out of asphalt instead of something else such as rubber?

Assistant: Roads are made out of asphalt because it is a type of petroleum-based material that is often used to bind loose soil and gravel together, and which will generally resist erosion.
Why are roads made out of asphalt instead of something else such as rubber?
It’s hard to know why, exactly.  There are several hypotheses though, and here’s one that makes sense to me:  
Asphalt is an aggregate of fine rock powder called asphaltite and it’s the durable qualities of asphaltite that make asphalt strong.
Roads are made out of asphalt because it is a type of petroleum-based material that is often used to bind loose soil and gravel together, and which will generally resist erosion.