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Largest Ocean Largest Sea Largest Lake Largest River. Pacific. world's largest ocean at 60,060,700 mi 2 (155,557,000 km 2 ) it covers 28% of the Earth = nearly all of the land area on the Earth

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Presentation Transcript
slide2

Largest Ocean

Largest Sea

Largest Lake

Largest River

pacific
Pacific

world's largest ocean at 60,060,700 mi2 (155,557,000 km2)

it covers 28% of the Earth = nearly all of the land area on the Earth

deepest point is the Challenger Deep within Mariana Trench 35,840 feet (-10,924 m)

important to geography not only because of its size but it has been a major historical route of exploration and migration

longest rivers in the world
Longest Rivers in the World

Nile

Amazon

YangtzeThree Gorges Dam

Mississippi

VolgaVolga detail & NPR story 7 min

Danube

dead zones

water changes everything
Water changes everything

freshwater is not evenly distributed throughout the world

½ of the world's water supply is contained in just 9 countries:

[source: World Business Council for Sustainable Development]

United States

Canada

Colombia

Brazil

Democratic Republic of Congo

Russia

India

China

Indonesia

water changes everything1
Water changes everything

urban areas, have a greater need for water beyond the basics for drinking and sanitation

overpopulation in undeveloped countries means that many people don't even get the basics

most of the world's freshwater ~ 2.4 million mi3 (10 million km3) is contained in underground aquifers

the rest comes from:

rainfall (after accounting for evaporation): 28,500 mi3(119,000 km3)

man-made reservoirs: 1,200 mi3 (5,000 km3)

lakes: 21,830 mi3 (91,000 km3)

rivers: 509 mi3 (2,120 km3)

[source: World Business Council for Sustainable Development]

slide13

some countries don't have enough clean water for their rapidly growing populations, and they can't afford the infrastructure necessary to clean and transport it

most people in China's cities suffer from water shortages, and most of China's groundwater, lakes and rivers are polluted

~ 700 million Chinese people have access only to drinking water that does not meet standards set by the World Health Organization

countries in the Middle East use the least amount of water per person because there are so few natural sources of freshwater

in contrast, the usage of water is higher in the United States than in any other country, ~ 60,000 ft3(1,700 m3) of water used per person in 2002

[source: Organization for Economic Co-operation and Development]

even within the United States, there are some states and regions that don't contain enough water to supply their populations

coastal regions of Florida have so much saltwater that they must have freshwater piped in from inland areas, which has led to political disputes over control of the water supply