An area where rivers flow into the ocean is called a(n)
a. estuary.
b. mangrove swamp.
c. salt marsh.
d. coral reef.
Answer: A
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Based on the U.S. and European experience, as countries become more developed,
A. services replace manufacturing as the largest proportion of GNI. B. manufacturing replaces services as the largest proportion of GNI. C. agricultural output increases as a proportion of total GNI. D. retail and wholesale trade decreases.
If a bare field and a forest are side by side, the field will usually have a higher maximum temperature on any given day
Indicate whether the statement is true or false
As a consequence of the reintroduction of the gray wolf into Yellowstone National Park and northern Idaho, the following other wild species have made a comeback:
a. Beavers b. round squirrels, mice, and gophers c. willow, aspen, and cottonwood trees d. beavers, ground squirrels, mice, gophers, willow, aspen and cottonwood trees. e. wolf reintroduction caused other species to decline, not reemerge or increase.
Keeling's reports from Mauna Loa demonstrated ________
A) that as distances from cities decreased, CO2 concentrations increased B) that CO2 levels have been stable over the last 40 years C) that sediments deposited on the seafloor can yield clues about past climates D) the presence of El Niño E) an increase in tropospheric CO2 from the 1950s to present