How much has carbon dioxide in the atmosphere risen since the beginning of the Industrial Revolution?
a. 8%
b. 18%
c. 28%
d. 38%
e. 48%
d
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When Earth's continents were assembled as Pangaea, they covered much of Earth's surface that lies near the equator. Why did this warm the Earth's climate?
A. The Sun's most intense radiation struck land instead of water. B. It restricted the flow of surface currents. C. both of the above D. neither of the above
The primary occurrence of the rock-forming minerals olivine, pyroxene, and amphibole is:
a. igneous rocks. b. metamorphic rocks. c. sedimentary rocks. d. A and B e. all rock types
What economic, political, and social system emerged from the collapse of feudalism?
A) representative government B) autocracy C) democracy D) world trade E) capitalism
The rate of plate movement is only a few ________ per year so climate changes triggered by shifting plates happen on a scale of millions of years
A) centimeters B) decimeters C) feet D) meters E) millimeters