How is the valuable part of an ore mineral removed?
A) by heating the ore in boiling temperatures
B) by breaking its mineral bonds
C) by dissolving the ore in water and acid
D) by using a magnet to remove the metal
Answer: B
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For most of human history, and in developing countries today, the major source of energy has been
A) natural gas. B) oil. C) wind. D) muscle power.
Nucleic acids
A. store energy in living organisms. B. consist of folded strings of amino acids. C. store genetic information in living organisms. D. act as hormones that allow cells to communicate with one another.
Many common sayings about the weather, such as "red sky at morning, sailor take warning; red sky at night, sailor's delight" are rooted in ____
A) careful observations B) forming a hypothesis C) careful experimentation D) posing a question
Which of the following states will most likely experience the greatest warming in the next 50 years?
A) Florida B) Hawaii C) Alaska D) Illinois