Links
[1] https://www.e-education.psu.edu/earth501/author
[2] https://www.e-education.psu.edu/earth501/l1_p2.html
[3] https://www.e-education.psu.edu/earth501/l1_p3.html
[4] https://www.e-education.psu.edu/earth501/l1_p4.html
[5] https://www.e-education.psu.edu/earth501/l1_p5.html
[6] https://www.e-education.psu.edu/earth501/l1_p6.html
[7] https://www.e-education.psu.edu/earth501/l1_p7.html
[8] https://www.e-education.psu.edu/earth501/l1_p8.html
[9] https://www.e-education.psu.edu/earth501/l1_p9.html
[10] https://www.e-education.psu.edu/earth501/l1_p10.html