Orbital eccentricity refers to ____
A)the need to add a "leap day" every four years
B)variation in the timing of Earth's equinoxes
C)how much Earth is tilted on it's axis
D)how close Earth is to the Sun
E)how circular or elliptical Earth's orbit is
E
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The dissolved salts in seawater increases the freezing point, explaining the formation of sea ice
Indicate whether the statement is true or false
Why was Erik the Red able to explore Greenland in the 10th century AD?
A) He managed to sail the North Atlantic during a two-year period of minimal storms. B) His explorations took place during a particularly warm climatic period. C) There was no glacial ice in Greenland at the time. D) Sea temperatures were cooler, so there was less propensity for storms.
Traditionally the term "haoles" was used to describe an elite group in Hawaii who profited from commercial sugarcane plantations
Indicate whether the statement is true or false
In addition to the current levels of air and water pollution, a list of important environmental issues would most likely include:
A. emissions of greenhouse gases B. safe disposal of hazardous waste materials C. destruction of wetlands and other habitats D. extinction of species and all of the above