Recent calculations show that the Tunguska explosion in Siberia in 1908 was probably caused by a
A) large stony meteorite about 1 m across striking the ground at a high speed.
B) small nuclear explosion.
C) small comet nucleus about 1 km across suddenly vaporizing in the atmosphere.
D) small stony asteroid about 80 m across exploding well above the ground.
Correct Answer:
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