What are the eight most common elements found in the Earth's crust, listed from most common to least common (by percent)?
a. oxygen, silicon, aluminum, iron, calcium, sodium, magnesium, potassium
b. oxygen, silicon, aluminum, iron, calcium, sodium, potassium, magnesium
c. magnesium, potassium, sodium, calcium, iron, aluminum, silicon, oxygen
d. oxygen, silicon, aluminum, iron, calcium, potassium, sodium, magnesium
e. oxygen, silicon, aluminum, iron, calcium, magnesium, potassium, sodium
b. oxygen, silicon, aluminum, iron, calcium, sodium, potassium, magnesium
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The global human population is expected to
A) grow faster and faster over the next century. B) crash in the next century. C) exceed 10 billion by 2100. D) begin to decrease by 2100.
The New World Monkeys evolved in Central and South America after those landmasses split
from Africa. Indicate whether the statement is true or false.
Which of the following accurately describes 18O/16O ratios of ice sheets?
A) During warmer periods, 18O evaporates more readily and therefore the 18O/16O ratio is higher. B) The higher the ratio of ice core 18O/16O, the cooler there temperatures because the 18O will be locked up in ice sheets. C) During periods of colder temperature, the 18O/16O ratio is higher because only the 18O isotope is being evaporated. D) During warmer periods, 16O evaporates more readily and therefore the 18O/16O ratio is significantly lower than colder periods.
The main "ingredient" in the formation of coral is ________.
A) nitrogen B) barnacles C) plant roots D) waves E) calcium carbonate