Climate in the United States by bhz15729

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									Climate in the United
       States
       P. Lobosco
       Climate Regions of U.S.
•   Mediterranean
•   Marine West Coast
•   Moist Continental
•   Moist Subtropical
•   Desert
•   Steppe
         Division of Regions

• The regions are divided based on
  temperature and precipitation.
       Mediterranean Region
• The coast of California has a
  Mediterranean climate. The name comes
  from the area around the Mediterranean
  Sea. In the winter cyclones and moist
  maritime polar air masses bring heavy
  precipitation. In the summer there is
  almost no rain. Plant growth consists of
  shrubs and stunted trees. Agriculture is a
  major occupation.
   Marine West Coast Region
• The northwestern coast of the United
  States has a marine west coast climate.
  This is a rainy climate because moist air
  from the Pacific rises and releases
  precipitation onto the Cascade Mountains.
  This produces mild winters and cool
  summers. The type of plant life that is
  common is the forest of needle-leaved
  trees, cedar, spruce, redwood and fir. The
  economy is based on lumber and paper.
     Moist Continental Region
• The northern part of the United States
  extending from the Midwest to the Atlantic
  coast of the United States. Continental
  polar air masses flowing south produce
  very cold winters. In the summer the area
  receives warm tropical air masses. There
  are forests of broad-leaved trees and
  needle-leaved trees. Commercial
  agricultural is the main occupation.
     Moist Subtropical Region
• The southeastern United States has a moist
  subtropical climate. Precipitation is higher and
  summers are hot due to maritime tropical air
  masses flowing inland. In the winter polar air
  masses mix with the maritime tropical and
  produce colder winters. The plant life consists
  of broad-leaved and needle-leaved trees, such
  as oak, chestnut and pine. Citrus fruits are
  grown in this region. Animal life includes
  herons, egrets, alligators, crocodiles and
  manatees.
    Desert and Steppe Region
• Located within the western interior of the Untied
  States are two regions that similar climates. The
  desert and steppe regions begin east of the
  western mountain ranges and end in the Great
  Plains. Steppe receives slightly more
  precipitation. Plants, including yucca, and
  sagebrush grow in the desert. The steppe has
  short grass and scattered forests of needle-
  leaved trees. Grazing of livestock occurs here.
  Highlands (Variable) Region
• These regions are located in the
  mountains. The climate varies with
  latitude and elevation. The temperature is
  low. Precipitation increases with
  elevation. Forestry is the major industry.
  Fir and pine grow here. Mountain areas
  are used for summer grazing for livestock
  from the Great Plains.
             Land Biomes
• Climate determines plant life.
• Plant life determines animal life.
• Scientists classify areas with similar
  climates, plants and animals into divisions
  called biomes.
         Biomes of the U. S.

• The major land biomes of the United
  States are:
• tundras
• coniferous forests
• deciduous forests
• tropical rain forests
• grasslands
• Deserts.
                Tundras
• Tundras cover about 10% of the Earth’s
  surface. IN the United States they are
  only found in Alaska. The climate is
  extremely cold and dry. Tundras receive
  less than 25 centimeters of rain and snow.
  Almost 85% of Alaska if permafrost or
  frozen soil.
          Tundra Plant Life
• Plant life on the tundra consists mainly of
  mosses and grasses. Lichen (algae and
  fungi growing together) cover the rocks
  and bare ground. Tall trees cannot grow.
         Tundra Animal Life
• Lichens are the main food of caribou.
• Wolves prey on caribou.
• Birds such as ptarmigan and small
  animals such as lemmings inhabit the
  tundra.
• Arctic terns are seasonal residents.
          Coniferous Forest
• South of the tundra biomes are the
  coniferous forest biomes. The soil here
  thaws in the spring making the forest floor
  wet and swampy. A coniferous biome is
  also called a taiga. This biome can be
  found in parts of Alaska as well as at the
  higher elevations of the Rocky Mountains.
  The rainfall is between 50 and 125
  centimeters and the temperature is cold.
   Coniferous Forest Plant Life
• The trees that live in this biome are
  needle-leaved trees or conifers. Conifers
  produce their seeds in cones. They
  include firs, spruces and pines.
  Redwoods grow in Washington, Oregon
  and northern California. Southern
  California supports a coniferous biome
  known as a chaparral which consists of
  shrub like plants.
 Coniferous Forest Animal Life
• Large animals in the coniferous forests
  include wolves, deer, black bears, grizzly
  bears and moose. Smaller animals such
  as beaver, hares, and red squirrels also
  live here. Crows and great-horned owls
  build nests among the conifers. Grouse
  roost in the branches.
         Deciduous Forests
• South of the coniferous forest biomes are
  the deciduous forest. Deciduous forests
  begin at the northeastern border between
  the United States and Canada. The
  summers are warm and the winters cold.
  Rainfall is between 75-150 centimeters a
  year.
   Deciduous Forest Plant Life
• Deciduous trees shed their leaves in the
  autumn. Oak, birch, maple, hickory and
  beech are the most common varieties
  found in the United States. In the spring
  wildflowers and ferns cover the forest
  floor.
  Deciduous Forest Animal Life
• Many different animals make their home in
  deciduous forests. Thrushes,
  woodpeckers, cardinals and blue jays are
  birds that live in these forests. Snails,
  worms, snakes and salamanders live on
  the forest floor. Small mammals, such as
  squirrels and raccoons live in the branches
  of the trees.
        Tropical Rain Forest
• In the United States, tropical rain forests
  are only found in Hawaii. Rainforests
  receive at lest 200 centimeters of rainfall a
  year. Temperatures are warm year
  round.
 Tropical Rain Forest Plant Life
• Rain forests have more varieties of plant
  life than any other biome. Trees may grow
  to a height of 35 meters or more. High
  above the forest floor, the tops of trees
  met to form a canopy. The canopy is so
  thick that sunlight may not reach the forest
  floor for 10 minutes. Most plant grow in
  the canopy. Orchids and ferns grow on
  the branches of trees. Woody vines hang
  from trees.
         Tropical Animal Life
• Animal life in the rain forest is rich and
  varied. Some rain forest animals spend
  their entire life in the trees and never touch
  the forest floor. Parrots, toucans and
  hundreds of other birds live in the trees.
  Insects, tree frogs and snakes crawl on
  the trunks and branches of trees. Bats
  hunt at night.
              Grasslands
• The grassland biomes receive between 25
  and 75 centimeters of precipitation a year.
  The grasslands of the Midwestern plains
  have hot summers and cold winters.
       Grasslands Plant Life
• Grasses make up the main group of plants
  in this biome. There are few trees due to
  low rainfall. Fires, which occur often,
  prevent widespread tree growth. Today,
  most of the original grasslands have been
  replaced with pastures and farms. Wheat,
  corn and other grains are farmed on the
  Midwestern plains.
      Grasslands Animal Life
• Gophers, prairie dogs, and other small
  animals live on the grasslands. Black
  birds, prairie chickens and meadow larks
  are some of the birds that feed on the
  grasshoppers, locusts and other insects.
  Bison and elk, large plant eaters, were
  once common. They were hunted by
  wolves and cougars. Since farms have
  replaced most of the grasslands, large
  animal live only in protected areas.
Deserts
                Deserts
• Deserts receive less than 25 centimeters
  of rain a year. Desert biomes in the
  United States are located in the
  Southwest. Although deserts can be hot
  or cold, the deserts of the southwestern
  Untied States are hot.
          Desert Plant Life
• Plants that exist in the desert have
  adapted to a lack of rainfall. The fleshy
  stem of cacti help then to store water.
  Some can store up to a ton of water. Most
  flowering plants in the desert produce
  seeds and die within a few weeks due to
  lack of rainfall.
          Desert Animal Life
• Like the plants, animals must be able to
  survive with very little rainfall. Plant eating
  animals such as jack rabbits and kangaroo
  rats obtain most of their water from the
  plants they eat. Meat-eating animals,
  such as cougars, obtain most of their
  water by eating the plant eaters. Most
  desert animals hide from the hot sun
  during the day and come out to eat only at
  night, when temperatures are cooler.

								
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