Surface waves are useful for investigating Earth's interior because they
A) refract at the boundaries between Earth's layers.
B) reflect at the boundaries between Earth's layers.
C) cast shadows indicating Earth's layers.
D) none of the above
D
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Each circle represents an atom. Which of the following boxes contains an element? A compound? A mixture?
A. element: C; compound: A, B; mixture: B B. element: A, C; compound: A, B; mixture: A C. element: A, C; compound: A, B; mixture: A, B D. element: A, C; compound: A, B, C; mixture: A, B
The following population pyramid is indicative of
A) a country with very few children
B) rapid growth
C) zero growth
D) slow growth
E) negative growth
Surface mining, when compared to subsurface mining, ____.
A. is more dangerous B. is more expensive C. produces less waste material D. disturbs more land E. causes subsidence
Which of the following is true about zwitterions?
A) They are positively charged. B) They are negatively charged. C) They are electrically neutral. D) The charge depends on the zwitterion.