Explain why death tolls from hurricanes are much higher in poor countries
What will be an ideal response?
ANSWER: The majority of the population are impoverished and forced to live in areas at high risk of natural disasters. Many people of South America are forced out of fertile valleys and onto vulnerable hillsides to live. Resource-rich delta regions are dangerous low-lying coastal areas to which people of poor countries often look for food despite being in danger of floods and storm surges. Much of Central America is mountainous, with fertile valley bottoms that are mostly controlled by large corporate farms. Many people have big families that survive on little food and marginal shelter; unable to afford land in the valley bottoms, they decimate the forests for building materials and fuel for cooking, leaving the slopes vulnerable to frequent landslides. Others migrate in search of work to towns in valley bottoms, where they crowd into marginal conditions on floodplains close to rivers subject to flash floods and torrential mudflows fed from denuded slopes.
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Trace the major processes in the evolution of the earth's atmosphere from its beginning to the present
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The mantle is the largest layer in terms of mass and volume
Indicate whether the statement is true or false
Why do rocks weather?
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When a solution of ammonium chloride, NH4Cl, is added to a solution of lead(II) nitrate, Pb(NO3)2, a white precipitate of lead chloride, PbCl2, forms. Which of the following is the total ionic equation for this reaction?
A) 2 NH4Cl(aq) + Pb(NO3)2(aq) ? PbCl2(s) + 2 NH4NO3(aq) B) 2 NH4+(aq) + 2 Cl-(aq) + Pb2+(aq) + 2 NO3-(aq)? PbCl2(s) + 2 NH4+(aq) + 2 NO3-(aq) C) Pb2+(aq) + 2 Cl-(aq) ? PbCl2(s) D) Pb2+(aq) + Cl22-(aq) ? PbCl2(s)