How can Silly Putty and a hard, plastic cube be used to model different layers of Earth?

The color and texture of both things can be used for the upper middle and lower layers of the earth

When a virus infects a host cell, it uses the cell's machinery to make copies of its own genetic material in a process called replication. finally, during the process of self-assembly, that protein shell and the copies of the virus's genetic material are assembled into new viruses.