Which statement is true concerning estuaries?
A) Organisms cannot survive in estuaries.
B) Estuaries are very vulnerable to pollution.
C) The salinity in estuaries is stable, with very little fluctuation.
D) An estuary is a type of delta.
B
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Because deep-ocean circulation is driven largely by variations in water temperature and salinity, it is also called ________ circulation.
A) thermohaline B) anaerobic C) hydrothermal D) hypoxic
The five closest planets to the sun are called the terrestrial planets
Indicate whether the statement is true or false
Floods only occur when there is excessive short-term precipitation or a dam failure.
Answer the following statement true (T) or false (F)
This photograph shows an upper unit with fragments and a lower unit with tilted layers. Which of the following statements is true?
A. The lower unit is older because it was tilted and eroded before deposition of the upper unit. B. The upper unit is younger because it contains pieces of the underlying unit. C. The upper unit is younger because it is on top. D. All of these choices are correct.