On this map of the south Atlantic, why is the mid-ocean ridge in the center of the ocean?
A. Subduction has occurred under one and then another of the adjacent continents.
B. Seafloor spreading has stopped in this area.
C. Seafloor is added to both sides during seafloor spreading.
D. Subduction is consuming seafloor beneath both adjacent continents.
Answer: C
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Which of the following statements about water is true?
A) At temperatures above 4°C, warmer water will rise. B) At temperatures above 4°C, warmer water will sink. C) At temperatures between 0°C and 4°C, warmer water will rise. D) At temperatures below 0°C, warmer water will sink.
Most of the world's aluminum comes from which of the following?
a. quartz b. bauxite c. hematite d. plagioclase e. basalt
The majority of lightning strikes occur ____
A) from a cloud to the ground B) from one cloud to another cloud C) from a cloud to the surrounding air D) within a cloud
In a nuclear power plant fueled with uranium-235, what is the purpose of the moderator?
a. slow neutrons b. maintaining power outputs c. shut down the reactor if there is a loss in cooling water d. prevent a runaway chain reaction