The Snowball Earth hypothesis posits that the Earth’s surface became entirely or nearly entirely frozen at least once, some time earlier than 650 Mya (million years ago).
Do supercontinents make it hot? make it cold? Do climate patterns shift?
Nobody knows anything. They have these little theories that help them feel smart and in control, but most of this stuff becomes laughable with 20 years of first being put forward.
Snowball Earth could not have happened. It is a conclusion based on a false hypothesis. Check out the presentations found here:
http://www.threeimpacts-twoevents.com/wp-content/uploads/2012/10/SIMULTANEOUS-IMPACTS7.pdf
and
http://www.threeimpacts-twoevents.com/wp-content/uploads/2012/10/COMET-IMPACT14.pdf