The line that shows the successive positions of paleopoles in the past is called:
a. paleopole line
b. apparent polar-wander path
c. polar shift line
d. paleopole path
Answer: b. apparent polar-wander path
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Why do northern and southern Africa appear much darker in Figure 20-4b than in 20-4a?
The question is based on Figure 20-4, infrared images of Africa taken 9 hours apart. What will be an ideal response?
Which of the following is not considered one of the global crop hearths?
A) East Asia B) Sub-Saharan Africa C) Southwest Asia D) Southeast Asia E) Central North America
Why is the amount of carbon dioxide dissolved in seawater much less than the theoretical maximum saturation level?
A) Carbon dioxide is very soluble in water. B) Carbon dioxide is able to form a weak acid when combined with seawater. C) Carbon dioxide is quickly used by photosynthetic organisms. D) Carbon dioxide moves quickly from the atmosphere to the ocean.
The Canadian River flows through ________ and eventually into the ________
Fill in the blank(s) with correct word