Which of the following has dominated food-generating practices in the twentieth century?
A) hunting and gathering
B) commercial agriculture
C) subsistence agriculture
D) pastoralism
E) swidden agriculture
Answer: B
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Which sequence of events is required to form a limestone cave where you can walk around and observe cave formations, such as stalactites?
A) Limestone found below the water table, then lowering of the water table, then water dripping from the ceiling B) Lowering of the water table, then water dripping from the ceiling, then limestone found below the water table C) Water dripping from the ceiling, then lowering of the water table, then limestone found below the water table D) None of these are correct.
This can only be seen when the sun is to your back and it is raining in front of you
A) sundog B) halo C) rainbow D) sun pillar
On what basis are air masses classified?
What will be an ideal response?
According to the map in the textbook, which continent had the greatest percentage of its land covered by ice?
A) Asia B) North America C) South America D) Europe E) Australia