List the three stages of stream development, and explain what happens in each along with the associated changes to the surrounding topography
In the initial stage, stream valleys are narrow, v-shaped, and eroding downward. Generally topography is fairly hilly and mountainous.
In the intermediate stage, streams begin to erode laterally and meanders form. There is a narrow floodplain on either side of the river and the river occupies a narrow valley.
In the advanced stage, meanders enlarge and an large, flat floodplain has developed. It may contain oxbow lakes and meander scars.
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Which statement about mercury is true?
A. Mercury is found only in the atmosphere. B. Mercury slowly breaks down and degrades in the environment. C. At high doses, Mercury is a neurotoxin. D. Only two states have issued warnings about the mercury content of fish. E. The EPA has issued concerns about mercury, but the UNEP has not.
What trend is threatening the survival of the Zoroastrian community?
A) persecution by Sikhs B) environmental devastation in their homeland of Bhutan C) emigration from the region in search of economic opportunity D) the abandonment of the belief system for Hinduism E) intermarriage and low fertility
Choose the option that puts the following steps in the correct sequence
1. An electric sensor records the signal's travel time. 2. A transducer changes the signal into a thump on the rock. 3. An electrical signal is delivered. 4. The wave travels through the rock. A) 4, 2, 3, 1 B) 3, 4, 1, 2 C) 3, 2, 4, 1 D) 4, 1, 2, 3
Köppen believed that the distribution of natural ________ was an excellent expression of the totality of climate
Fill in the blank(s) with correct word