World Geography

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World Geography

• Chapter 3 Weather and Climate

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Chapter 3, Section 1 Factors that affect
climate

• I. The Sun and Latitude
• Tilt of the earth as the planet revolves around
  the Sun.
• Determines which hemisphere receives the most
  direct sunlight, which causes changing seasons.
• Suns energy
• ½ of the energy is absorbed in the atmosphere
• Earths surface absorbs the other ½
• Solar (form the Sun) energy is converted into
  heat and measured according to temperature.

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The Sun and Latitude cont.

• Greenhouse Effect earths atmosphere traps heat
  energy.
• The greenhouse effect helps keep the planet warm,
  but recent evidence shows that the Earth has
  gotten noticebaly warmer. What might cause this?

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The Sun and Latitude cont.
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• So what activities might be causing global
  warming?
• Eric Cartmans backside?

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• Animals?

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• No, humans probably, activities like
• 1. Burning coal or fossil fuels.

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• The oil industry

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• Burning oil, coal, natural gas, and other fossil
  fuels add CO2 to our atmosphere. And CO 2
  absorbs heat, thus raising the temp.

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II. Atmospheric Pressure

• The air around you is constantly pushing you, a
  force called atmospheric pressure, or air
  pressure.
• As you climb a mountain, there is less air
  pushing you down, thus the air gets thinner is
  harder to breath as humans.

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Air pressure cont.

• At such high altitudes, air is too thin to
  breath, that is why planes are air sealed and
  pressurized.
• When you fly on a plane, your ears pop because of
  the changes in air and cabin pressure.

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• Hopefully this doesnt happen to you on a plane,
  because of the air pressure change.

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Air pressure cont.

• Low pressure area when air is heated it expands,
  becomes less dense, and rises, creating a low-
  pressure area. As the air rises and cools, the
  water vapor it carries forms into clouds.
• Low pressure usually accompanies unstable weather
  conditions.
• Centers of low pressure are called cyclones.

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• Cold air is dense and sinks towards Earths
  surface, creating centers of high pressure.
• High pressure systems usually bring more stable
  weather conditions.

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Global Wind Belts
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Global wind belts cont.

• Prevailing winds winds that blow from the same
  direction most of the time.
• Sailors use the prevailing winds to guide trips.
• The zone of winds along the equator is calm, with
  no prevailing winds called the doldrums.

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Global wind belts cont.

• A front occurs when two air masses of vastly
  different temperatures collide.

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III. Oceans and Currents

• Oceans also affect climate.
• Location in respect to an ocean changes climate.
  Landlocked areas will be cooler than locations
  near oceans because of warm currents that carry
  heated waters.

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Chapter 3, Section 2, Weather Factors

• I. Precipitation
• The process with which water changes from liquid
  to a gas is called evaporation.
• The amount of water vapor in the air is called
  humidity.
• Condensation is the process with which water
  vapor changes from gas to a liquid.

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Storms

• Hurricanes the most powerful and destructive
  tropical cyclones.
• Typhoons hurricanes in the Western Pacific Ocean
  areas (Asia).
• Tornadoes twisting spirals of air in the middle-
  latitude areas.
• The U.S. has more tornadoes than any other
  country.

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• So, weather, how bout it?

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Section 3.3 Climate and Vegetation Patterns

• Tropical Climates
• Tropical Humid Climates
• Example Vietnam, Indonesia
• Areas close to the equator
• They never have truly cold weather.
• Because the warm air is always rising, this
  unstable air leads to almost daily thunderstorms
  and heavy rainfall.
• In some parts of the tropical humid climates all
  rainfall is concentrated into a wet season,
  similar to

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Conditioner is better, I make the hair silky and
smooth.
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Section 3.3 cont

• Tropical wet and dry climates
• Just to the N and S of the tropical humid
  climate.
• Also called the tropical savanna climate.
• A savanna is an alternating pattern of wet and
  dry season.

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Section 3.3 cont

• Dry Climates
• Arid climates stable sinking dry air all year.
• Locations include Mexico, Southern Africa, and
  South America for example.
• Soils tend to be thin and rocky.

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• Since this topic can be so
• Dry
• Zing!
• Its time for one of Steckens riddles
• Try to figure out the answer to the following
  pictures by combining them.

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• Considering something In deep thought

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• Any ideas????

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• If peeing your pants is cool Consider me Miles
  Davis.

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• Semiarid climate
• Receive more moisture than Arid climates but less
  than more humid areas.
• Humid subtropical climate
• Found on the eastern side of continents where
  there are warm air ocean currents.
• Usually contains forests.

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Section 3.3 cont

• Deciduous forests trees that lose their leaves
  during part of the year
• Coniferous forests remain green all year.

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Section 3.3 cont.

• High latitude climates-
• Subarctic climate Canada, Greenland, Northern
  Russia, parts of northern Europe.
• Cold climate, but also supports vast evergreen
  forests.
• Tundra climate permanently frozen soil called
  permafrost.

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Section 3.3 cont

• Ice Cap climate found on Earths polar regions.