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Mars Mercury Venus Earth’s Moon (S. Pole)

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Presentation on theme: "Mars Mercury Venus Earth’s Moon (S. Pole)"— Presentation transcript:

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5 Mars Mercury Venus Earth’s Moon (S. Pole)

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8 Mistastan Lake, New Foundland, Canada 28 Km 38,000 years

9 Barringer Meteor Crater, AZ 1.18 km 49,000 years

10 Wolf Creek, Australia 0.875 Km 300,000 years

11 Bosumtwi, Nigeria 10.5 Km 1.3 Million years

12 Roter, South Africa 2.5 km 5 Million years

13 Karakul, Tadjikistan 45 Km < 10 Ma

14 Chicxulub, Mex 170 Km 65 Ma

15 Clearwater Lakes, Sask. 32 km/22km 290 Million years Deep Bay, Sask. 13 km 100 Million years

16 Gosses Bluss, Australia 22 km 142.5 Million years

17 Aorounga, Chad 17 km 200 Million years

18 Manicougan Lake, Quebec 100 km 212 Million years

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20 Radar Image of NEO 1999JM8 Missed Earth by 5 million km in 1990, 6 million km in 1999 Average diameter 3.5 km

21 80 million trees knocked down over 2,150 square kilometres (830 square miles Tunguska Event, 1908, Russia

22 Tunguska Event 1908 Equivalent to a 100 MT Nuclear Bomb Blast

23 Question If cratering rate on Earth is same as our Moon, why are their so few craters preserved?

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29 What is wrong here?

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31 Apollo 14 site spherules (~ 0.2 mm diameter) Argon40/Argon39 dates (accuracy ~ +/- 200 MY)

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33 Apollo 14 site spherules (~ 200 micro-meters diameter) Argon40/Argon39 dates (accuracy ~ +/- 200 MY) => 26 Ma periodicity

34 1 BY averaging bins Black and opaque spherules only

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36 Question: If cratering rate on Earth is same as our Moon, why are their so few craters preserved? Answer: Erosion

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