Radioisotopes ______.
A) emit radiation as they decay into more stable atoms
B) emit only radio waves
C) are charged atoms
D) are atoms with differing numbers of protons
Radioisotopes usually have more neutrons than the most stable form of the atom. To get to a stable form, they give off energy and matter (neutrons or electrons), which we call radiation.
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Precipitation in desert areas is ____
a. caused by cyclonic activity b. associated with the high sun season c. irregular, unreliable, and sometimes extreme d. caused by orographic lifting of cT air masses e. quite predictable, but minimal
For many of the less developed countries, what is the situation for their terms of trade?
A) exporting low-valued commodities and importing high-valued ones B) exporting low-valued commodities and importing low-valued ones C) exporting high-valued commodities and importing high-valued ones D) exporting high-valued commodities and importing low-valued ones E) several exports and no imports
What would have happened to the earth if it were 10% closer to the sun?
A) Our sun would have burned out after a few hundred million years so life would not evolve. B) Our atmosphere would consist mainly of carbon dioxide. C) Liquid water and the water cycle would not exist. D) Our atmosphere would consist mainly of nitrogen.
Over the last four decades, global energy consumption has decreased
Indicate whether this statement is true or false.