Carol works for the U.S. Fish & Wildlife Service and is surveying an area to
determine if it meets the requirements to be classified as a wetland. Which of
the following is NOT a requirement for her to take into consideration?
~ The area must have standing water year-round
provisional
~ ...
Tillage is primarily used for which of the following?
✓~ Control weeds and aerate soil
How much of the earth's land surface is covered with grasslands?
✓~ 20 to 40 percent
Select all the services grasslands provide
✓~ Provide very important habitat for wildlife
Filter runoff from precipitation
Build deep and rich soils
Store carbon dioxide from the atmosphere
Grasslands typically exist between which of the following?
✓~ Forest and desert
,Which of the following is NOT a main threat which plagues grasslands today?
✓~ Lasting effects from Dust Bowl
When topsoil is lost, the loss is fairly permanent because the process to create
just three centimeters of topsoil takes about 1,000 years.
✓~ True
Which of the following best describes the Farm Bill?
✓~ Incentives provided to landowners to conserve grassland habitats
Where are savannas typically found?
✓~ Africa, Australia and South America
Which of the following is the specific mission of the Natural Resources
Conservation Service?
✓~ To conserve soils for agricultural production
Why do temperate grasslands have the most fertile soil on earth?
, ✓~ Grass roots decaying below the surface enriches the soil with
nutrients
A wetland with woody plants, saturated/slow moving water and a lack of oxygen
in the soil can be described as a _____.
✓~ Swamp
Select all the factors in which a wetland is classified.
✓~ Hydrological regime
Landscape position
Vegetation cover
Wetlands are economically important due to which of the following factors?
✓~ Wetlands provide both commercial and recreational fisheries
Wetlands are NOT critical for which of the following?
✓~ Developing agricultural land
Levees are most commonly used for which of the following?
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