Season 1 Episodes13
Cast1

Corey Johnson
Self - Narrator (voice)
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Ranked #9 of 13 in Season 1•−0.1 vs season avg
Asteroids might provide clues about the formation of early Earth; detective work uncovers that a big nickel deposit in Canada, vast oil reserves in the Gulf of Mexico and a gold mine in South Africa all resulted from asteroid impacts.

Corey Johnson
Self - Narrator (voice)
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"Asteroids" is episode 10 of How the Earth Was Made season 1. It scored 8.2/10 from 31 votes, ranking #9 of 13 episodes this season (season average 8.3). It aired on April 21, 2009.