The best approximation of the true outer boundary of the continents is the seaward edge of the ____________.
A. abyssal plain
B. continental shelf
C. mid-ocean ridge
D. present-day shorelines
E. deep-ocean trench
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The age of the deepest sediment in an ocean basin ____________ with increasing distance from the oceanic ridge.
A. increases
B. remains the same
C. decreases
D. varies
The principle of uniformitarianism indicates that ______.
A. the past is the "key" to the future
B. tomorrow is the "key" to the past
C. the present is the "key" to the past
D. the past is the "key" to the present
How does a geologist distinguish between glacial deposits and regular sediment deposited in rivers or lakes?
A. glacial deposits have minerals usually lost to physical weathering during normal sedimentary processes
B. glacial deposits consist primarily of mechanically weathered rock debris only
C. glacial deposits consist primarily of well-sorted, rounded grains of quartz and clay
D. glacial deposits have minerals usually lost to chemical weathering during normal sedimentary processes
Which of the following best describes why glaciers form?
A. Glaciers form anywhere where there is direct sunlight and warm annual temperatures.
B. Glaciers form anywhere where there is a winter season.
C. Glaciers form anywhere where there is significant indirect sunlight or cold annual temperatures.
D. Glaciers form anywhere where there is no significant indirect sunlight or warm annual temperatures.
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