The last episode of extensive glaciation in North America was at its peak about ________ years ago.
A. 10,000
B. 18,000
C. 5,000
D. 2,000
Answer: B
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Of all the regions of the U.S., the landscapes of the west and Midwest have been affected the least by the Public Lands Survey System
Indicate whether the statement is true or false
La Niña conditions in the equatorial eastern Pacific Ocean can increase the risk of wildfires in the United States by ________ some parts of the country.
A. wafting firebrands from Central America into B. raising the temperature of the stratosphere over C. wafting firebrands from South America into D. causing less rain to fall in E. bringing a low-pressure system over
Which two gases are primarily responsible for the greenhouse effect because of their ability to absorb infrared energy?
A) oxygen and hydrogen B) ozone and dust C) nitrogen and oxygen D) water vapor and carbon dioxide
Gas bladders help seaweeds: a. hold tight to the seafloor
b. keep their upper portions near the surface. c. photosynthesize nutrients. d. reproduce.