The Earth's core can be divided into the outer and inner components. The outer core is liquid because of the high temperature, while the inner core is solid due to the even greater pressure.
a. true
b. false
Answer: a. true
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The most direct and fundamental relationship between overgrazing and soil erosion is that
A) overgrazing leads to soil compaction. B) overgrazing increases that amount of suspended particles in the air. C) overgrazing causes eutrophication. D) overgrazing leads to the loss of vegetation.
The most effective antimalarial strategies involve the use of
A) DDT, bed nets, and quick access to drug treatment. B) DDT, immunization, and the drainage of all standing water in a region. C) immunizations, surgery, and a change in diet. D) sterilization of mosquitoes, treatment of mosquito breeding sites, and antibiotics.
One of the discoveries which led to the modern view of the solar system was that the orbits of the planets are ________
A) parabolas B) hyperbolas C) ellipses D) circles
The most common human health response to air pollution is
A. Skin cancer B. Heart disease C. Inflammatory responses in sensitive tissues D. Blindness caused by deteriorating eye tissues E. Lung cancer