Astroblemes and cratering
Early ideas on craters: Meteor Crater, Arizona and G. K Gilbert - on the moon, but not on earth.
Factors that determine crater density of portion of a planetary surface?
Cratering rates with time?
Crater morphology and classification.
Reading for next time: Chapter in text on Mercury.
Discussion question for next time: Fault scarps (wrinkle ridges) on Mercury suggests crustal contraction has occurred. What is the most reasonable mechanism to produce these, and why aren't similar contractional fault scarps seen on the moon?
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