Plate-tectonic processes on earth have been active for at least
A. 57 million years.
B. 200 million years.
C. 3 billion years.
D. 500 million years.
Answer: C
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Environmental groups for secondary and postsecondary (college) students help participants
A. Develop their organizational skills B. Become ecologists C. Come together to multiply the efforts of people with the same goals and ideals D. Learn how to become effective radical environmentalists E. Come together to multiply the efforts of people with the same goals and ideals, and also help them develop their organizational skills
What allows water to be a polar molecule?
a. Hydrogen bonds b. Adhesion c. Surface tension d. The angular shape of the molecule
Which of the following regarding atmospheric pressure is true?
A) While the atmosphere exerts pressure, it is a negligible amount. B) The tropopause serves as a buffer against the pressure exerted by the atmosphere. C) Air pressure at sea level is approximately 1013.2 mb. D) Atmospheric pressure is greatest in the mesosphere. E) Atmospheric pressure increases with altitude and is, therefore, lowest near the Earth's surface.
If the intensity of radiation 1.0 m from a source is 300. mCi, what is the intensity 3.0 m from the source?
A) 100. mCi B) 33 mCi C) 9.0 x 10^2 mCi D) 2.7 Ci