What is the average elevation of this esker?
A sinuously curving, narrow ridge of coarse sand and gravel is called an esker. Eskers form along the channel of a meltwater stream that flows beneath a glacier, in an ice tunnel, or between ice walls beneath the glacier. As a glacier retreats, the steep-sided esker is left behind in a pattern roughly parallel to the path of the glacier.
Over 1000'
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All of the following are typical effects of dam construction except
A) interruption of the normal seasonal variation in flows of water. B) increased amount of sediment carried downstream of the dam. C) disruption of natural ecosystems. D) protecting towns from flooding.
When geologists trace a layer of sediment or sedimentary rock laterally, the layers change in composition, texture, or both. These changes result from the ____
A)metamorphosis of the constituent rocks B)tilting of the parent rock during formation C)abrupt disturbances of the depositional environment D)different rates of weathering in different layers of rock E)simultaneous operation of different processes in adjacent depositional environments
The ____ _____ _______is one of Africa's most spectacular physical features, with broad steep walled trough extending from the Zambezi Valley northward to the Red Sea and the valley of the Jordan River
Fill in the blank(s) with correct word
Why is carbonic acid the most abundant acid in chemical weathering?
A) Carbon dioxide is present in the atmosphere and in soil; it combines with water vapor in the atmosphere and water percolating through soil to produce weak carbonic acid. B) Carbon dioxide easily breaks down to carbonic acid. C) Carbonic acid is so good at chemical weathering that it appears all the time. D) Acetic acid is rare, so carbonic acid is common.