TS 6th grade science RESOURCES test chapter 3
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Created by:
victoriabigdelle on March 28, 2011
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48 terms
Terms | Definitions |
|---|---|
 why is antarctica important? | has minerals and oil |
| what was done to protect antarctica in 1998? | 26 nations agreed to ban mining and oil exploration for atleast 50 years |
| what are the 3 catergories of envi. issues? | resource use, population growth, and pollution |
| what is a natural resource? | anything in the environment that is used by people |
| what is a renewable resource? | a resource that is either always available or is naturally replaced in a short time EX:trees |
| what is a nonrenewable resource? | a resource that is not replaced in a useful time frame EX:oil |
| what has happened to the population over the last 2000 years? | increased rapidly |
| as the human population increases what happens to our need for resources? | increases also |
| what is pollution? | contamination of water, air, or land |
| what causes pollution? | chemicals, wastes, noise, heat, and light |
| relate population, pollution, and resource use | if the population increases then resources will also increase and a lot of the resources will become pollution |
| what is environmental science? | study of natural processes in the environment and how humans can affect them |
| what is the "delicate" balance between? | between needs of environment and needs of people |
| what are costs and benefits? | bad and good things |
| what is the main type of costs and benefits? | environmental |
| pick an environmental issue and write the costs and benefits | EX:drilling for resources in antarctica COSTS-destroys habitat BENEFITS-gets oil and minerals for humans to use |
| list some reasons why trees are important | gives oxygen, fruits, lumber |
| what type of resource are trees? | renewable |
| what is sustainable yield? | an amount of a renewable resource such as trees that can be harvested regularly without affecting the future supply |
| what is a fishery? | an area with a large population of valuable ocean organisms |
| why is the fish population declining? | overfishing |
| what are some methods in place to help with overfishing? | a larger mesh allows baby fish to escape, regulated laws, outlawed methods such as: poising fish with cyanide or stunning fish by putting dynamite underwater |
| why is it hard to find the exact number of species? | some places are too hard to be studied thoroughly |
| what is biodiversity? | the number of different species in an area |
| which species has the largest biodiversity? | insects |
| what is keystone species? | a species that influences the survival of many other species in an ecosystem EX:sea otter |
| the balance of nature gets__________if theres no biodiversity | ________________= destroyed |
| what are the 3 factors affecting biodiversity? | area, climate, diversity of niches |
| what are genes? | the structures in an organisms cells that carry its hereditary |
| why is genes important? | determine organisms characteristics from size and apperance to its ability to fight deseases |
| TRUE or FALSE? exinction is a natural process | TRUE |
| TRUE or FALSE? humans are increasing the rate of exinction | TRUE |
| give an example of an animal that went exinct because of humans | passenger pigeon |
| TRUE or FALSE?there are endangered and threatened species found on every continent and ocean | TRUE |
| list some natural causes of extinction | earthquake, tsunami, volacano |
| list some human causes of exinction | habitat destruction, poaching, pollution, invasive species |
| what is the major cause of exinction? | habitat loss |
| what is habitat fragmentation? | breaking larger habitats into smaller isolated pieces or fragments |
| what is poaching? | illegal killing or removal of wildlife from their habitat |
| why do people poach? | for skin, fur, teeth, or claws. sell the animals they kill. animal parts can be used for making medicines, jewelery, coats, belt, and shoes FOR MONEY |
| why are invasive species bad? | mess up food chain |
| list 3 succesful aproaches to protecting biodiversiy | california condor(captive breeding) american alligator and green sea turtle(laws and treaties) yellowstone national park( habitat preservation) |
| how did captive breeding help the califorinia condor? | population increased from 15 to 200 |
| what did american medical association want to protect?why? | wanted to protect earths biodiverstiy because they wanted to preserve undiscovered medicines that may exist |
| where can the pacific yew tree be found? | temperate rainforests |
| what part of the pacific yew tree did scientists study? | the bark |
| what is taxol used for? | cancer fighting |
| do scientists still use the pacific yew tree? why or why not? | no they dont because they have recreated it in a different form |
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