Which element would have chemical properties the most similar to chlorine (Cl)?
A. Br
B. Na
C. S
D. Ar
E. O
Answer: A
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How much of the light that reaches Earth's surface is captured by organisms?
a. One part in 2
b. One part in 20 c. One part in 200 d. One part in 2,000 e. One part in 20,000
Ten seconds after starting from rest, a skydiver in free fall has a speed of about
A. 100 m/s. B. 10 m/s. C. 500 m/s. D. 50 m/s. E. more than 500 m/s.
The focus of equations in this textbook is
A. a route to "plugging and chugging." B. to challenge students weak in math. C. recipes for solving algebraic problems. D. guides to thinking.
Which piece of evidence does not point to the accretion of a wet Earth?
A) meteor water ratio compared to Earth rocks B) Moon rocks compared to Earth rocks C) zircon crystals in granite D) craters on the Moon