Put the four phases of lunar surface formation in order from the oldest to the youngest. (Note: "First" refers to the oldest event whereas "Fourth" refers to the youngest event.)
A) Excavation of large impact basins
B) Formation of rayed craters
C) Filling of mare basins
D) Formation of original crust
1) First
2) Second
3) Third
4) Fourth
Answers: 1) D 2) A 3) C 4) B
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