Which of the following describes mass wasting?
A) downslope movement of soil and rock due to gravity
B) deterioration of an atom because of radioactivity
C) blockage of sunlight by volcanic ash
D) the destruction of sedimentary rock by earthquakes
E) agricultural damage resulting from a tsunami
A
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In the scientific process, projections are tested with further experiments, models or observations
Indicate whether the statement is true or false
Many free-market economists, among others, believe that all of these principles should govern use of public lands except:
a. Cut old-growth forests in national forests and replace them with tree plantations. b. They should be used primarily for protecting biodiversity, wildlife habitats, and ecosystems. c. The American people deserve fair compensation for use of their property. d. All users or extractors of resources on public lands should be held responsible for damage they cause. e. No one should receive tax breaks for extracting resources on public lands.
Using these maps and graphs, describe and explain the patterns of temperature gradients on Figures 9.4a and 9.4b: Where are gradients steep or gentle?
a) January:
b) July:
The decline in approximately 70% of the world's bird species is particularly alarming to scientists because
a. This is the first time any bird species have been threatened with declining numbers. b. It is not caused by any human activities that scientists can determine. c. Only land birds are affected, while water birds seem to be maintaining normal population numbers. d. Birds are excellent environmental indicators. e. Birdwatching now generates a significant portion of tourist dollars in some countries.