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Chapter 3 Living Resources
Environmental Issues
36
Science
8th Grade
09/28/2011

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Term
Natural Resource
Definition
Anything in the environment that is used by people.
Term
Renewable resource
Definition
A resource that is either always available or is naturally replaced in a relatively short time.
Term
Nonrenewable resource
Definition
A natural resource that is not replaced in a useful time frame.
Term
Pollution
Definition
Contamination of land, water or air.
Term
Environmental science
Definition
The study of the natural processes that occur in the environment and how humans can affect them.
Term
Clear-cutting
Definition
The process of cutting down all the trees in an area at once.
Term
Selective Cutting
Definition
The process of cutting down only some trees in an area.
Term
Sustainable Yield
Definition
an amount of a renewable resource that can be harvested regularly without reducing the future supply.
Term
Fishery
Definition
An area with a large population of valuable ocean organisms.
Term
Aquaculture
Definition
The practice of raising fish and other water-dwelling organisms for food.
Term
Biodiversity
Definition
The number of different species in an area.
Term
Keystone species
Definition
A species that influences the survival of many others in an ecosystem.
Term
Gene
Definition
A structure in an organisms cells that carries its heretitary information.
Term
Extinction
Definition
The disappearance of all members of a species from Earth.
Term
Endangered species
Definition
A species in danger of becoming extinct in the near future.
Term
Threatened species
Definition
A species that could become endangered in the near future.
Term
Habitat destruction
Definition
The loss of a natural habitat.
Term
Habitat Fragmentation
Definition
The breaking of a habitat into smaller isolated pieces.
Term
Poaching
Definition
Illegal killing or removal of wildlife from their habitats.
Term
Captive Breeding
Definition
The mating of animals in zoos or wildlife preserves.
Term
What are 3 types of environmental issues that affect us.
Definition
Resource use, population growth, and pollution.
Term
What 3 improvements helped our population to grow?
Definition
Medicines, agriculture and waste disposal.
Term
Name a few common resources we use from the forest.
Definition
Fruits, seeds, rubber, lumber, paper, furniture,oxygen.....
Term
Can forests be a renewable resource? How?
Definition
Yes, if we plant new trees to replace the ones we cut down.
Term
More than 1/2 of the species on Earth are?
Definition
Insects
Term
Tropical rain forest takes up less than 7% of land but has what percentage of species?
Definition
50%
Term
Name two examples of keystone species.
Definition
Sea otters and sea stars.
Term
Why are fishing limits set?
Definition
To prevent overfishing and extinction.
Term
Name two examples of keystone species.
Definition
Sea otters and sea stars.
Term
Name some items we get from biodiversity.
Definition
Food, clothing, tourism, jobs, money...
Term
True or False. Biodiversity has both economic value and ecological value within an ecosystem.
Definition
True
Term
Factors that affect biodiversity in an ecosystem.
Definition
Area, climate, and diversity of niches.
Term
True or False. Many plants, animals, and other organisms are economically valuable for humans.
Definition
True
Term
This common garden flower is used to treat some forms of cancer.
Definition
Foxglove
Term
What are the cancer fighti
Definition
Term
What are the cancer fighting crystals that are found under the bark of the yew tree?
Definition
Taxol
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