What might be a few issues with having an unnamed source?

if your talking about like a website an issue would be that you dont know how much experience the writer of the site has on the subject in order to find a good source you need to find a site with .org .edu .gov

Explanation:

folds are formed when heat and pressure is applied to the rock. the higher the temperature, the more pliable rocks become. folds are more likely to occur when the deformation caused by the compression is applied slowly. faults are defined as the displacement of rock that were once connected along a fault line.

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answer; the period of time known as the middle ages;