What is the most accurate description of the principle of a lightning rod?
A) The lightning rod acts to discharge the thunderstorm.
B) The lightning rod intercepts the lightning and safely carries the lightning current around the object it protects.
C) Lightning rods have been used since the 1700s, but the principle of their operation is not known.
D) A positive charge induced in the lightning rod repels the negative charge in an approaching step leader.
B
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Which of the following is an accurate statement about tropical rain forest climates?
A. They are influenced by the ITCZ year-round. B. They experience a cold season. C. Thunderstorms rarely occur there. D. They contain many xerophytes.
The blood-brain barrier is permeable to which of the following species?
A) oxygen B) carbon dioxide C) glucose D) all of these
Antecedent streams can flow through a mountain range because _____
a. extreme flow velocities allowed them to flow over the top of the mountains b. bedrock solution gradually opens a tunnel through the mountains that collapses c. headward erosion connects two streams on opposite sides of the mountains d. the gap in the mountains existed before the stream flowed through it e. the stream existed before the establishment of the mountains
Succulents, such as the saguaro cactus (Carnegiea gigantea) found in southern Arizona, southeastern California, northern Mexico, and the Baja Peninsula, are representative vegetation in which biome?
A) Tropical savanna B) Mediterranean shrubland C) Midlatitude grassland D) Deserts