science flashcards chapter 3 and 4
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Created by:
adiahaknight on January 6, 2012
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29 terms
Terms | Definitions |
|---|---|
 Biodiversity | refers to the varity of life in an ecosystem. |
| extinct species | is a species that was once present on earth but has died out. |
| endangerd species | a species in danger of becoming exinct is classified as an endangerd species. |
| threatened species | if a species is likely to become endangered in the near futureit is classified as a threatened species. |
| introduced species | is a species that moves into an ecosystem as a result of human actions. |
| Native Species | are the original organisms in an esosystem. |
| Acid Rain | forms when sulfur dioxide and nitrogen oxide released by industries and automobiles combine with water vapor in the air. |
| ozone depletion | the thinning of the ozone layer is called ozone depletion. |
| convervation biology | the study of methods for protecting biodiversity is called conversation biology. |
| habitat restoration | is the process of taking action to bring a damaged habitat back to a healthy condition. |
| captive population | is a population of organisms that is cared for by humans. |
| reintroduction programs | return captive organisms to an area where the species once lived. |
| measurement | is a way to describe the world with numbers. |
| estimation | can help you make a rough measurement of an object. |
| precision | is a description of how close measurementss are to each other. |
| accuracy | when you compare a measurement to the real,actual,or accepted value,you are describing accuracy. |
| SI | to aviod confusion scientists established the International System Of Units,or SI |
| meter | is the SI unit of length . |
| volume | the amount of space an object occupies is its volume. |
| mass | the mass of an object measures the amount of matter in the object. |
| kilogram | is the SI unit for mass. |
| weight | is a measurement of force. |
| kelvin | temperature is measured in SI with the kelvin. |
| rate | is the amount of change of one measurement in a given amount of time. |
| table | displays information in rows and columns so that it is easier to read and understand. |
| graph | is used to collect ,organize ,and summarize data in a visual way. |
| line graph | shows the relationship between two varaibles. |
| bar graph | uses rectangular blocks ,or bars ,of varying sizes to show the relationships among varaibles. |
| circle graph | shows the parts of a whole. |
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