8.3.2.1.1 Explain how the combination of the Earth’s tilted axis and revolution around the sun causes the progression of seasons
Source: MN state standards
https://www.youtube.com/watch?v=pLl8sDZRSYghttps://www.youtube.com/watch?v=pLl8sDZRSYg
Source: youtube.com
https://drive.google.com/a/chisagolakes.k12.mn.us/#folders/0B2mrVHKEZfPkYTl1UXFmVTh6eVU
Source: ck-12 flexbook