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Science Final Review
Science 6 Final Review
| Question | Answer |
|---|---|
| Natural Resource | anything naturally occurring in the environment that humans use |
| nonrenewable resource | a natural resource that is not replaced in a useful time frame |
| fossil fuel | energy-rich substance formed from the remains of organisms |
| nuclear fission | the splitting of an atom's nucleus into two nuclei, which releases a great deal of energy |
| impact | a forceful, damaging contact |
| mineral | a naturally occurring solid that can form by inorganic processes and that has a crystal structure and a definite chemical composition |
| ore | a naturally occurring mineral from which a metal or a valuable mineral can be extracted |
| solution | a mixture of water and another substance |
| scarce | to be insufficient or in short supply |
| groundwater | water that fills the cracks and spaces in underground soil and rock layers |
| porous | having tiny holes or spaces through which liquid or gas may pass |
| aquifer | an underground layer of rock or sediment that holds water |
| renewable resource | a resource that is either always available or is naturally replaced in a relatively short time |
| population growth | the increase individuals in a population or a particular group |
| exponential | growth at an ever-increasing rate so that the larger a population gets, the faster it grows |
| consumption | use of something |
| greenhouse effect | the trapping of heat near a planet surface by certain gases in the planet’s atmosphere |
| climate change | a sudden or gradual change in Earth's climate |
| fluctuate | shift back-and-forth uncertainly |
| pollution | contamination of the earth's land, water, or air |
| conservation | the careful use of a resource to prevent it from being wasted and make it last longer |
| mitigation | the process or result of making something less severe or dangerous |
| correlation | a relationship or connection between two or more events |
| energy efficiency | using less energy to perform the same task |
| irrigation | the watering of land by artificial means to aid plant growth |
| levee | a bank constructed to prevent flooding |
| urban development | the process of developing a town or a city by building new buildings |
| desertification | the advance of desert-like conditions into areas that previously were fertile; caused by over farming, over gazing, drought, and climate change |
| retention | the act of holding something |
| wetlands | areas where water covers the soil, or is present at or near the surface of the soil for some or all of the year |
| seasons | a period of the year with certain patterns of weather and day lengths |
| axis | an imaginary line that passes from Earth’s North Pole through to the South Pole |
| appear | to seem or give the impression of |
| solstice | a day of the year when the noon sun reaches its highest or lowest point in the sky |
| equinox | a day when neither hemisphere of Earth is tilted toward or away from the sun, and day and night are the same length |
| cyclic | occurring in a cycle, regularly repeating |
| phase | one of the different shapes of the moon seen from Earth |
| lunar eclipse | a period when Earth is directly between the sun and moon, partially or totally blocking sunlight from reaching the moon and reflecting off its surface back to Earth |
| solar eclipse | a period when the moon is directly between Earth and the sun, partially or totally blocking sunlight from reaching Earth's surface |
| solar system | the sun, planets, and a variety of other objects |
| sun | an average-sized star, composed of helium and hydrogen, at the center of the solar system |
| astronomical unit (AU) | a unit of distance equal to the mean distance from the sun to the Earth, or about 150,000,000 km |
| planet | an object that orbits the sun, has become rounded by its own gravity, and has cleared the area of its orbit |
| moon | a natural object that orbits a planet |
| asteroid | a small, mostly rocky or metallic body that orbits the sun in the inner solar system |
| dwarf planet | an object that orbits the sun and has enough gravity to be round but has not cleared the area of its orbit |
| composition | the parts or elements that make up something |
| comet | a loose ball of ice and rock that usually has a long, narrow orbit around the sun |
| gravity | a non-contact force that pulls objects with mass toward each other |
| nuclear fusion | a reaction where two atoms combine to form a heavier atom |
| govern | to control or influence something |
| inertia | inertia the tendency of an object in motion to resist a change in motion unless acted upon by a force |
| galaxy | huge group of stars, dust, gas, planets, and other objects bound together by gravity |
| light-year | the distance that light travels in one year, about 9.46 trillion kilometers |
| universe | all of space and everything in it |
| big bang theory | a theory that proposes that the universe formed in an instant in an enormous explosion |
| land reclamation | the process of restoring an area of land to a more productive state |
Created by:
wtrscience6