Cobalt-60 is a radioactive isotope sometimes used in the treatment of cancer. Which of the following statements is true about an atom of cobalt-60?
A) It contains 27 neutrons.
B) It contains 27 protons.
C) It contains 60 neutrons.
D) It contains 60 protons.
B
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Which of the following expands most when the temperature is lowered? Equal volumes of
A) iron. B) wood. C) helium. D) water at 4°C. E) None expand when the temperature is lowered.
If the concentration of carbon dioxide in the atmosphere increases, Earth's average global temperature will
A) increase. B) decrease. C) stay the same. D) fluctuate wildly.
Sometimes referred to as the "Third Pole" the Tibetan Plateau is home to some 18,000 glaciers. The melt water from these glaciers provides drinking water to over a third of the people on the planet
Indicate whether the statement is true or false
Most of what is today Indonesia was a colony of the:
A) French B) Dutch C) British D) Spanish E) Portuguese