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Science Unit 9 Lesson 2 Human Impact On Land
Terms in this set (33)
What are the different types of Land Use?
Recreational, Transport, Agricultural, Residential, Commercial and Industrial
Recreational Land Use includes
natural areas and places that humans have left alone or have restored to a natural state. These wild places include forests, grasslands, and desert areas.
Transport Land Use includes
roads (covering 4 million miles of land in the US) and rail roads (covering 120,000 miles of land in the US).
Agricultural Land Use includes
much of the open land in rural areas utilized to raise crops (such as corn, soybeans, and wheat) and livestock (such as cows, pigs, and chickens).
How is agricultural land different from recreational land?
Agricultural land usually only has one or two types of plants (such as corn or cotton).
Recreational land contains many species of plants and animals.
Residential Land Use includes
homes where people live.
Urbanization is the
growth of urban areas caused by people moving into cities.
What is the difference between urban and rural areas?
Rural areas have large areas of open land and low densities of people.
Urban areas have small areas of open land and high densities of people.
Commercial and Industrial Land Use includes
buildings containing Commercial Businesses and the land utilized by Industrial Businesses (paper mills using trees, cement factories digging up limestone in quarries) and the roads built to take the product to where it is sold.
Many plants get the water and nutrients they need ...
from the soil.
Because plants form the base of food webs, healthy soil is
important for most land ecosystems.
Why is soil important?
It is a habitat for organisms.
It stores water and nutrients.
Earthworms, moles, badgers and other burrowing animals...
live in soil.
Decomposers are organisms that
break down dead animal and plant material, releasing the nutrients into the soil.
Falling rain soaks into soil and is stored
between soil particles.
Wetland soils store
large amounts of water and reduce flooding.
How does soil participate in the nutrient cycle?
1) Plants take nutrients from soil and water stored in soil.
2) Animals eat plants.
3) Plants and animals die.
4) Decomposers (earthworms) break down dead plants and animals, returning nutrients to the soil.
What was the Dust Bowl?
In the 1930s, huge clouds of dusty soil rolled across the southern Great Plains of the US. Areas that were once farmlands were wiped out.
What caused the Dust Bowl?
Farmers who settled in the Southern Plains cleared too many trees, overplowed and over grazed their land. When severe drought hit in 1931, topsoil dried out and blew away with the wind.
Land Degradation is the process by which
human activity and natural processes damage land to the point that it can no longer support the local ecosystem.
What can lead to Land Degradation?
Urbanization, deforestation, and poor farming practices.
Urban sprawl is when
urbanization occurs at the edge of a city or town, and replaces forests, fields, and grasslands with houses, roads, schools, and shopping areas.
What are the effects of Urban sprawl
it decreases farmland, decreases the size of natural areas, increases the amount of asphalt and concrete covering land, causes rainwater to run into storm drains instead of into soil.
Erosion is the process by which
wind, water, or gravity transports soil and sediment from one place to another.
When land is degraded, erosion can
Roots of trees and plants act as
anchors to the soil. When land is cleared for farming, the soil can be blown away by wind or washed away by rain.
What is nutrient depletion?
It is when the soil's nutrients are reduced. This can occur when a farmer plants the same crops every on the same piece of land which consumes the same type of nutrient from the land. This reduces or depletes the amount of that nutrient in the soil.
Desertification is the process by which
land becomes more desert like and unable to support life.
One cause of desertification is
when too many livestock are kept in one area, and they overgraze an area.
Deforestation is the
removal of trees and other vegetation from an area.
Some causes of deforestation include
logging for wood, surface mining, clearing trees for farming, and urbanization.
How can deforestation lead to desertification?
When trees are removed from land, the trees' roots no longer hold the soil down and when the wind blows or the rain falls, the soil is removed.
Why is soil important to an animal that eats other animals?
Because the animals that they eat get their food from plants which get their food from the soil.
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