How is chemistry, biology, and earth science related to skateboarding?I would like sources linking to each of them that explains throughly and how...

All three are definitely part of skateboarding.

The wheels for example, are usually made of polyurethane. The trucks are usually an aluminum alloy. There are other metals and plastics used as well. These are all made using chemistry.

Biology is also a big part of it. People fall off of their skateboards all of the time and injure themselves. They get scrapes, bruises, cuts, and even broken bones. In addition, the way people use their bodies to maneuver the skateboard is an example. It takes balance and coordination to properly control a skateboard. There are many muscles involved.

Earth science is involved as well. People ride skateboards over different types of terrain. The terrain may be flat, hilly, etc.