Which of the following is the reason that strontium-90 is considered an especially dangerous radioactive isotope?
A) It has an exceptionally short half-life.
B) It has an exceptionally intense radioactivity.
C) It is chemically incorporated into bone and teeth and is therefore not readily eliminated from the body.
D) all of the above
C
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How much would the world's sea level rise if the Greenland ice cap completely melted?
A. 23 feet B. 2 feet C. 100 feet D. 73 feet
Suppose that you saw clouds that were high in the sky and that looked like wispy strands of tattered cloth. An hour later, it started to rain. The clouds you noticed were
A) cumulonimbus clouds. B) alto stratus clouds. C) cumulus clouds. D) cirrus clouds.
What is the most visible manifestation of eutrophication?
a. Hypoxia b. Decomposition c. Nitrogen fixation d. Plankton bloom
What typically happens when a warm front passes through a region?
A. temperatures fall, pressures fall B. temperatures rise, pressures fall C. temperatures fall, pressures rise D. temperatures rise, pressures rise