Approximately ________% of the food we consume comes from ________ crop species
A) 90; 15 B) 90; 100 C) 50; 20 D) 10; 100 E) 50; 50
Answer: A
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Toxic metals such as lead, cadmium, and mercury
A. Usually don't accumulate in food chains B. Can be toxic if high concentrations are reached C. Are the most common health threat in water D. Can be toxic in extremely small quantities E. Rarely threaten water supplies
What does "-zoic" in the eras of the geologic time scale refer to?
A) Life B) Water C) Rock D) Fossilization
The discovery that the universe appears to be expanding led to a widely accepted theory called ________
A) Hubble's Law B) Einstein's Law C) the Doppler effect D) the Big Bang
What chemical weathering process most commonly occurs as “rusting”?
A. hydrolysis B. carbonation C. oxidation D. exfoliation E. hydration