Assuming the impact hypothesis is correct, in what way(s) was the impact important to our existence on Earth today?
A. Water from the impact-generated tsunami explains why regions of North America are agriculturally fertile today.
B. The iridium and other metals brought to Earth by the impact have proven to be very important for modern electronic devices.
C. Prior to the impact, early humans had been threatened by dinosaurs, but after the impact they were free to develop civlization.
D. It seems unlike that we would have evolved by now without the extinctions caused by the impact.
Ans: D. It seems unlike that we would have evolved by now without the extinctions caused by the impact.
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The only way to make sound travel faster in air is to change the air's ____________
Fill in the blank(s) with correct word
The period from about 100 seconds up to 15 minutes after the Big Bang is the:
A) Radiation Era. B) Lepton Epoch. C) Nuclear Epoch. D) Decoupling Epoch. E) Matter Era.
Refer to the speedometer in Figure 2.3. The speedometer reading 75 mph is
A. 200 meters per second. B. the only speed at which mph and km/h are equal. C. approximately 2 kilometers per minute. D. exactly 1 mile per minute.