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by: Phuong

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# Homework Help

Phuong
ASU

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COURSE
PROF.
TYPE
Class Notes
PAGES
2
WORDS
CONCEPTS
Earth Science
KARMA
25 ?

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This 2 page Class Notes was uploaded by Phuong on Thursday August 11, 2016. The Class Notes belongs to at Arizona State University taught by in Fall 2016. Since its upload, it has received 3 views.

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Date Created: 08/11/16
1   Define and describe the hydrologic cycle. The hydrologic cycle is a gigantic worldwide system powered by energy from the  Sun in which the atmosphere provides the vital link between the oceans and the  continents. Water evaporates into the atmosphere from the ocean and to a much  lesser extent from the continents. Winds transport this moisture­laden air, often  great distances, until conditions cause the moisture to condense into clouds and to  precipitate and fall. The precipitate that falls into the ocean has completed its cycle  and ready to begin another. The water that falls on the continents, however, must  make its way back to the ocean. 2   Explain how the cooling rate of a rising parcel of unsaturated air differs from a rising parcel of saturated air. Why do they differ?  As an unsaturated parcel of air rises no latent heat is released thus the  cooling is at the dry adiabatic lapse rate. The dewpoint decreases by 2 C/km as  unsaturated air rises. Dewpoint decreases because lowering pressure has an  influence on the thermodynamic variable of dewpoint that does not occur with  mixing ratio.  As a saturated parcel of air rises condensation is taking place. The  condensed moisture leaves the parcel as rain. The temperature and dewpoint fall  together at the same lapse rate as the saturated air rises. Explain the causes of acid rain and describe one effect. 3   Causes of acid rain:  Natural resources: The major natural causal agent for acid rain is volcanic  emissions. Volcanoes emit acid producing gases to create higher than normal  amounts of acid rain or any other form of precipitation such as fog and snow to  an extent of affecting vegetation cover and health of residents within the  surrounding.  Man­made resources: Human activities leading to chemical gas emissions  such as sulfur and nitrogen are the primary contributors to acid rain. The  activities include air pollution sources emitting sulfur and nitrogen gases like  factories, power generations facilities, and automobiles. In particular, use of coal  for electrical power generation is the biggest contributor to gaseous emissions  leading to acid rain.  Effect: Effect on forest: It makes trees vulnerable to disease, extreme weather, and insects  by destroying their leaves, damaging the bark and arresting their growth. Forest  damage due to acid rain is most evident in Eastern Europe ­ especially Germany,  Poland and Switzerland.

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