The study of paleomagnetism is possible because:a
the magnetic minerals in rocks create the Earth's magnetic field.
b. most rocks contain no magnetic minerals.
c. the magnetic minerals in rocks disrupt the Earth's magnetic field.
d. the magnetic minerals in a cooling lava point toward the north magnetic pole.
e. none of these
D
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Destruction of rain forests results in
A) disruption in the oxygen and carbon dioxide cycles of forests. B) an increase in biological diversity. C) stabilization of the global temperature. D) increased agricultural production and less hunger. E) both an increase in biological diversity and a stabilization of the global temperature.
In 1968, the U.S. Congress passed the ____ to establish protection of rivers with outstanding wildlife, geological, scenic, recreational, historical, or cultural values.
A. National Rivers and Wetlands Act B. National Rivers of Interest Act C. National Wild and Scenic Rivers Act D. Federal Freshwater Act E. Federal Scenic Waterways Act
The monoclonal antibody drug Trastuzumab is used in the treatment of which disease?
A) breast cancer B) prostate cancer C) non-Hodgkin's lymphoma D) none of these
Cloud-to-ground lightning begins within the cloud when the localized electric potential gradient exceeds ____ volts per meter along a path perhaps 50 m long
a. 300 b. 3,000 c. 30,000 d. 300,000 e. 3 million