Mind Stretcher -
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Mind Stretcher -1. Which of the following is NOT a
way that nitrogen cycles through the environment?
a. Decomposition releases nitrogen into the soil.
b. Plant roots take up nitrogen from the soil.
c. Nitrogen is stored in fossil fuels. 2. Which process does NOT release
carbon dioxide? a. Combustionb. Respirationc. Photosynthesis
Earth’s BiomesChapter 23
Biomes are dependent on two very important environmental factors:
Average Temperature and Average RainfallBiomes are named after the dominant
type of vegetation associated with large land areas.
The three major biomes are: (1) Deserts, (2) Grasslands, (3) Forests
THE BOTTOM LINE:THE BOTTOM LINE:
BIOME
Organizer Cold Temp. Avg. Temp. Hot Temp.
Heavy Rainfall
Average
Rainfall
Light
Rainfall
TaigaConiferous or
Boreal
Forests
Tropical Deserts
Temperate Deserts
Cool Deserts
SavannaTropical
Grasslands
PrairieTemperate Grasslands
TundraPolar
Grasslands
Deciduous Temperate
Forests
Tropical Rain
Forests
Celsius Scale30’s Warm20’s Nice10’s Cold
0’s Ice
Deserts have these qualities:1. Precipitation is low and limited2. Evaporation exceeds precipitation
(Rain dries out very fast)3. Light vegetation & clear skies4. Most animals are small and nocturnal
(come out at night)5. Hot days – Cool nights!!
Types of DesertsTropical Desert - hot all year, few plants, wind-blown surfacesEX: Sahara
Dese
rt Clim
ate
G
raph
Types of DesertsTemperate Deserts - Daytime temp. hot
in summer & cool in winterEX. The Mojave Desert
Types of DesertsCool Desert – Warm summers & cold,
cold wintersEX: The Gobi Desert
Brrr…It’s cold here
Desert Food Web
QUESTION?????What do all of these deserts have in
common? Think of three observations.
NO, you don’t have to write this question
down!
Grasslands have these qualities:1. Precipitation is high enough to allow grass to
grow.2. Droughts and fires prevent permanent forests.3. Home to large herbivores (bison, zebras etc.)
and many borrowing animals (meerkats, prairie dogs)
Types of GrasslandsSavanna (Tropical Grassland): high avg. temps. with a prolonged dry season of 4-6 months. Rest of the year is wet.
Types of GrasslandsPrairie (Temperate Grasslands):
Strong winds that blow almost continuously & evaporation is rapid.
Pra
irie C
limate
G
raph
Types of GrasslandsTundra (Polar Grasslands): Most of the year
the climate is extremely cold with high winds & snow cover. Winters are long and avg. precipitation is low (mostly snow)
Question????? Close your eyes and imagine a simple
savanna food web. What would happen in your food web, if the
top level consumers were removed?
HANDS FREE!EYES ON ME!EARS PLEASE!
Forests have these qualities:1. A wide variety of plants, dominated by
trees.2. Provides a variety of habitats for a
variety animals. (birds, deer, bears, mice, opossum, insects, etc.)
Types of forests:Tropical Rain Forests: constant hot temp.,
high humidity, daily afternoon rains, poor soil, hardwood trees, most animals live in the canopy, most biologically diverse
Rain
fore
st Clim
ate
G
raph
Types of forests:Deciduous forests: moderate temps., changes
a lot during the 4 seasons, abundant precipitation, deciduous trees loose their leaves each fall, nutrient rich soils
Types of Forests:Taiga: winters are long & dry, lots of snowfall &
short days, temps. range from cool to extremely cold, dominated by conifers
Compare and contrastDraw the following venn diagram on your
paper and fill it in.
Forests
Deserts
Grasslands