A battery in a circuit causes a lightbulb to glow by providing energy to which of the following in the wires of the circuit?
a. Electrons
b. Protons
c. Heat
d. Light
Answer: a. Electrons
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The boundary between the zone of aeration and the zone of saturation is known as the
____________________. Fill in the blank(s) with the appropriate word(s).
Which of the following statements about cratons is not true?
A) They have been tectonically stable for more than 500 million years. B) They are usually less than a half of a kilometer above sea level. C) They are exterior regions of continents. D) They may be broken by faults.
The most accurate computer models of global climate change indicate that in the next 50 years
A) all of the rainforests will be destroyed. B) growing seasons will get shorter. C) the world will warm up by about 2°C. D) regions of drought will instead experience flooding.
The eastern part of the border between the United States and Mexico is delineated by
A) the Rio Grande. B) the Gulf of Mexico. C) the Mojave desert. D) the Mississippi River. E) the Rocky Mountains.