Transcript 2nd 6 Weeks District Test Review

nd
2
6 Weeks
District Test
Review
PowerPoint by: K. Pease
7th grade science, Plummer Middle School
How is vegetation or plant life
affected during droughts?
It will wilt from lack of water, then
it will die
Describe how Hurricane Ike impacted
the Gulf Coast ecosystem.
Destroyed large amounts of
habitats, land
Polluted water
Left people / animals without
homes
Predict how a natural disaster
would affect our ecosystem.
Destroyed large amounts of
habitats, land
Polluted water
Left people / animals without
homes
What is primary Succession?
The development or plant and
animal communities in an area in
which no topsoil exists, as in a
new lava flow
What is secondary succession?
The development of such
communities in an area that
has been disturbed but still
retains its topsoil, as in a
burned-over area
Compare / Contrast primary to
secondary succession.
Primary = no soil present
Secondary =past soil is present
What is the role of ecological
succession?
The gradual
replacement of
one type of
ecological
community by
another in the
same area,
involving a series
of orderly
changes.
After a devastating wildfire wipes out an
area of forest, describe the organisms
that might be found as succession
occurs.
Small grasses
Flowers
Small bushes, shrubs
Seedlings of young
trees
After a devastating volcanic explosion
wipes out an area, describe the
organisms that might be found as
succession occurs.
Small grasses
Flowers
Small bushes, shrubs
Seedlings of young trees
What is weathering?
Any of the chemical or
mechanical processes by
which rocks exposed to the
weather undergo
What is erosion?
The gradual wearing away of
land surface materials,
especially rocks, sediments
and soils, by the action of
water, wind or a glacier.
What is deposition?
The accumulation or laying down
of matter by a natural process, as
the laying down of sediments in a
river or the accumulation of
mineral deposits in a bodily
organ
How does chemical weathering connect
with cave formations in TX?
Geologic Processes- In order to understand how
cave formations form, we must understand how
the cavern itself is formed. Caverns are formed
when either rain, runoff rain water or surface water
goes into the topsoil or A-Horizon. Then Carbonic
Acid and Carbon Dioxide mix with the soil when
plants grow. This forms an acid that is literally
cutting and eats away at the limestone to form
cracks in it, much in the same way that water
forces cracks to open in frost wedging. This
geologic process is a type of chemical weathering.
Describe how weathering and erosion
have impacted Big Bend National Park.
http://www.utdallas.edu/scimathed/resourc
es/torch/bb00_geo-al.htm
Erosion in Big Bend is best defined by
rapid run-off and flash-flooding following
summer thunderstorms, but there are
other active agents of erosion.
Describe how deposition affects the
coastal regions of Texas.
During the summer months, people
fertilize and water their lawns. How do
these activities affect the surface water
and ground water?
How might overuse of water wells
affect the groundwater and surface
water in a watershed region?
Groundwater is and will continue to be a major source of water
for Texas. However, in many parts of the state, more
groundwater is being used than is being replenished through
natural means. If this practice continues, Texas water costs will
rise, land could subside, water quality could decline and people
in some areas could run out of water.
Pumping water from aquifers faster than they are recharged
has resulted in a lowering of the water table which has
increased the costs of pumping water from aquifers. Lowering
the water table has also resulted in land subsidence, altered
underground flow patterns, reduced water quality, and caused
many springs to go dry.
What are tundra and desert
examples of?
Correct
Answer: B Biomes
Give at least one reason why many
animals that live in the desert are
able to survive without directly
drinking water.
http://en.wikipedia.org/wiki/Kangaroo_rat
Answer is…
Desert animals get water from the plants
they eat.
Describe the Taiga and explain what
organisms are able to survive there.
Cold, High latitudes (mountains)
Coniferous Forest
Little Rainfall
Rain deer, Mice
Snowshoe rabbits
Wolverines
Adaptations:



Thick fur, color change with seasons
Hibernation
Migration
Describe the deciduous forest and explain
what organisms are able to survive there.
Change of seasons
Cool winters, warm summers
Moderate rainfall
Animals: deer, birds, rabbits, squirrels, insects,
small mammals
Plants: broad leaf trees, shrubs, birch, bushes
Adaptations:
 Hibernation
 Migration
 Food storage
Describe the desert and explain what
organisms are able to survive there.
Very hot in day / cold at night, dry climate, sand,
platues, mesa
Little to no rainfall
Animals: snakes, lizards, coyotes, jackrabbits, road
runners, insects, birds
Plants: cactus, tumble weeds, junipers, low shrubs
Adaptation:
 Dry, rough skin
 Water storage
 Nocturnal
 Eat plants to consume water
Why would a cactus be unable
to live in a tropical rainforest?
Stores to much water, would drown
Needs sandy soil
Not able to get enough sun due to canopy
Why do Monarch butterflies migrate
during season changes?
Food source
Weather change
How does hibernation help
organisms to survive?
To avoid the sever cold of winter
To conserve energy during limited food
supply
How does migration help
organisms to survive?
To avoid starvation due to limited food
Avoid undesirable climate
Instinctive
How would birds be different if their
bones make-up were similar to
humans?
Bones would be solid, dense

Unable to get off of ground due to weight
STUDY HARD!!!
YOU CAN PASS WITH 90% OR
BETTER!!!!