The Appalachian Mountains formed by continent-continent collision 300 million years ago. Explain why they persist as a mountain range today despite 300 million years of erosion
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Mountains are the result of tectonic forces and isostatic uplift due to erosion. Erosion causes a decrease in the thickness of a crustal block which means that the root portion of the block must decrease as well. The decrease in the mountain's root results in uplift, which results in further erosion, which results in more uplift.
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In developing countries, natural disasters are a greater risk for poor residents because ____.?
a. ?they are often forced to live in hazardous areas due to economic factors b. ?they are less likely to know the history of previous disasters in their region c. ?they are not well-educated and do not understand the danger d. ?they do not trust their governments and disobey laws that would keep them safe e. ?they find danger a desirable attribute because of their cultural traditions
The U.S. Surface Mining Control and Reclamation Act of 1977 requires ________
A) 20% of sales revenues to be donated to national park maintenance B) mining companies to post bonds to cover restoration of mined areas before permits are granted C) restoration of the identical ecosystem and biodiversity present before mining began D) no remediation of water pollution, except in the case of uranium mining E) all mined minerals to be processed and sold only within the United States
Which is NOT a factor that contributes to wave energy?
a. wave height b. wavelength c. density of water d. mass of moving water e. angle of approach of the wave to the beach
Discuss ways in which the Clean Air Act Amendments of 1990 addressed the failures of previous legislation
What will be an ideal response?