The mass of an atom of 12C is exactly 12 atomic mass units. Which of the following describes a mole of 12C atoms?
A) a sample which weighs exactly 12 atomic mass units
B) a sample which contains 6.02 x 10^23 atoms of 12C
C) both a and b
D) neither a nor b
B
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What event triggered a major slowdown in New Zealand's agricultural exports?
A) the loss of farm labor to New Zealand's growing industrial sector B) the British decision to join the European Union in 1973, which put in place strict agricultural protection policies C) the arrival of mad cow disease in New Zealand D) major climate change which limited the agricultural exports of New Zealand E) changing global markets which made Chinese agricultural exports cheaper
Earth's precession
A) means that Polaris is always the North Star. B) is responsible for changes in Earth's eccentricity. C) can slowly change the climate difference between summer and winter in the Northern Hemisphere. D) has the same time period as changes in obliquity. E) all of the above
Stream systems of interior drainage _____
a. have no tributaries b. flow to a regional base level instead of ultimate base level c. flow into the sea d. are always perennial and meandering e. are also known as exotic streams
Explain why infants and children are more susceptible to the effects of toxic substances than adults are
What will be an ideal response