Asteroid 2004 MN4 (Asteroid Apophis) was expected to pass very close to Earth on Friday, April 13, 2029, with collision odds initially calculated as 1 chance in 37. NASAs further calculations now suggest that odds of a 2029 Earth impact are about how much?
a. one in 1,000
b. one in 10,000
c. one in 50,000
d. one in 100,000
e. one in one million
Question 2
What geological material often forms at about the time of major extinctions, for reasons not understood by scientists today?
a. shocked quartz
b. flood basalts
c. ice layers
d. clay layers
e. stony-iron
Close-up of a cat's claw, with the quick clearly visible
Possible Earth 5 billion years from now
Schematic of the Earth–Moon system (without a consistent scale)
The Interiors of Earth and Mercury
A close-up showing the recessed center electrode on a spark tester. It is recessed 3/8 inch into ...
Close-up of a flat-disc amplifier (left) and a bell amplifier (right)