The__________estimates the total number of communicative civilizations in our galaxy
A) Copernicus scale
B) Drake equation
C) Kardashev scale
D) Kepler equation
B
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Estimation: A reasonable estimate for the duration of a typical physics lecture is
A. 600 s. B. 1000 s. C. 3500 s. D. 10,000 s.
What is the significance of stromatolites?
A) They appear to be fossils of structures made by microbes long ago. B) They indicate that microbes in the distant past were much larger than bacteria of today. C) They show that the oxygen content of Earth's atmosphere was much smaller in the past. D) They are the earliest known fossils of animals.
Which plate boundary has the lowest earthquake frequency?
You want to swim straight across a river that is 76 m wide. You find that you can do this if you swim at an angle of ? = 28° from the upstream direction at a constant rate of 1.5 m/s relative to the water
At what rate does the river flow? The angle ? is measured from the river bank (directly upstream is ? = 0° while directly across the river is ? = 90°). A) 1.3 m/s B) 0.70 m/s C) 1.6 m/s D) 1.8 m/s