During the early years of Earth, lighter elements such as silicon, magnesium, and aluminum rose to the surface, forming
Earth’s crust.
a. True
b. False
True
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Which of the following statements about cultural boundaries is most accurate?
a. Natural features usually determine the shape and direction of geometric boundaries. b. Ethnic boundaries tend to be less regular than geometric boundaries. c. Most of the border between the United States and Canada was drawn to separate ethnic groups. d. Religion is the most important cultural characteristic for drawing ethnic boundaries. e. British diplomats in the Middle East drew ethnic boundaries to create the modern state of Iraq.
The Stefan-Boltzmann Law gives the relationship between
A) solar energy and temperature. B) temperature and long-wave radiation. C) the intensity of radiation and the temperature of an object. D) emissivity and wavelength.
Which of the following is not a stated ancillary benefit of reducing greenhouse gas emissions?
A) Improved air quality. B) Increase in renewable and sustainable energy development. C) Greater dependence on imported oil. D) Fewer oil tanker spills.
Which of the following is among the most mature soils on Earth?
A) Andisols B) Inceptisols C) Entisols D) Oxisols