What Causes an Ice Age?

Although I'm sure many of us have heard the phrase "ice age," what exactly does that mean? Is it true we're in an ice age right now? Today we're exploring questions like these to better understand this climatic phenomenon.

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Some links:
https://en.wikipedia.org/wiki/Geologi...

https://www.ncbi.nlm.nih.gov/pmc/arti...

https://www.britannica.com/science/Cr...

https://newatlas.com/fossil-fats-snow...

https://opentextbc.ca/geology/chapter...

http://itc.gsw.edu/faculty/bcarter/ph...

http://academic.emporia.edu/aberjame/...

https://en.wikipedia.org/wiki/Quatern...

https://en.wikipedia.org/wiki/Quatern...

https://i.redd.it/g1s96i1sznt01.jpg

https://www.pnas.org/content/112/27/8232

https://darchive.mblwhoilibrary.org/b...

https://www.nature.com/articles/ngeo2931