Which of the following minerals is not a chemical compound?
A) halite (NaCl) B) graphite (C) C) quartz (SiO2 ) D) pyrite (FeS)
B
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Why do we use the pH scale to indicate the acidity of a solution rather than simply stating the concentration of hydronium ions?
A. It is used because the general public understands it. B. It includes the concentration of hydronium and hydroxide ions. C. It is more convenient, since the concentration of hydronium ions is so small. D. It is more accurate to use the pH scale.
Agricultural density is the number of
A) farm animals per area suitable for agriculture. B) farmers per area of arable land. C) farms per total area of land in a country. D) people per area of arable land E) acres of farmland per the total area of a country.
Low, thick stratus clouds have little effect on the Earth's climate
Indicate whether the statement is true or false
During which period did the break-up of Pangaea begin?
A) Permian B) Tertiary C) Triassic D) Jurassic