Author Question: How many sterilizing impacts have occurred on the Earth since the heavy bombardment? A) several ... (Read 74 times)

futuristic · **on:** Jul 27, 2018

How many sterilizing impacts have occurred on the Earth since the heavy bombardment?

A) several during the last 500 million years
B) many throughout the Earth's history
C) none
D) one, 65 million years ago

Question 2

The half angle of the conical shock wave produced by a supersonic aircraft is 60. What is the Mach number of the aircraft?

A) 2.0
B) 0.87
C) 1.73
D) 1.15
E)