What describes how the common cold spreads in the human body

It is done through the lytic cycle of the virus. This is the mechanism by which viruses infect a host, take over the function of the cells, and use them to replicate millions of new viruses in your body. See the related questions below about the lytic cycle.

35 cubic feet of dirt if it's digging a burrow

You can literally find this on google of each science career and search up what type of training you need and how many years in school