Which of the following is TRUE of 16O and 18O
A) Both the 16O and 18O isotopes occur in water molecules.
B) Neither the 16O and 18O isotopes occur in water molecules.
C) Only the 18O isotope occurs in water molecules.
D) Only the 16O isotope occurs in water molecules.
A
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Which economic model would benefit carpet industries and reduce waste?
A. Leasing carpets, and then recycling and replacing them when they wear out. B. Selling carpets to homeowners who have to buy new ones every few years. C. Homeowners can collect scrap pet hair and weave their own carpets. D. Throw out all old carpets and install hardwood floors.
Most of the radiation emitted by the earth and its atmosphere is in the category of:
A) x-rays. B) ultraviolet. C) infrared. D) gamma.
Comets have actually been observed striking a planet in our solar system.
Answer the following statement true (T) or false (F)
What is NOT true about chemical weathering?
A. more effective on larger surface areas B. decomposes through chemical alteration C. more effective on finer-grained materials D. proceeds faster in drier, cooler climates E. more effective with abundant water