The continental ice sheets over North America disappeared ____
a. between about 9,000 and 6,000 years ago
b. approximately 14,700 years ago
c. about 2.5 million years ago
d. between about 5,000 and 4,000 years ago
e. about 1300 years ago
ANSWER: a
You might also like to view...
____________ ____________ is the small net amount of mass transport of water in the direction of a wave that
contributes to the movement of the wind-driven surface currents. Fill in the blank(s) with the appropriate word(s).
Gross primary production is the rate of production of organic material by photosynthesis required for both the respiration of the plants or algae and the production of new material.
Answer the following statement true (T) or false (F)
What was "The Demographic Collapse" in Latin America?
A) the result of epidemics of diseases introduced by the Europeans B) a decline already in progress when the Europeans arrived C) the result of the high rates of internal migration after WW II D) the transition from high growth to low growth through birth control E) the result of civil wars prevalent during the 19th century
Mantle plumes are found primarily at:
a. divergent plate boundaries. b. convergent plate boundaries. c. transform plate boundaries. d. intraplate regions. e. none of the above