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gesmondi
6th Grade Science Final Exam Review
| Term | Definition |
|---|---|
| natural resource | anything occurring in the environment that humans use |
| fossil fuels | energy-rich substance formed form the remains of organisms |
| lava | liquid magma that reaches the surface |
| magma | a molten mixture of rock-forming substances, gases, and water from the mantle |
| solar power | power generated directly from sunlight |
| hydroelectric power | power that is generated from moving water such as rivers |
| geothermal energy | Heat that comes from inside the earth. It is available anywhere on the earth's surface |
| crystallization | the process by which atoms are arranged to form a material with a crystal structure |
| mineralization | the process where organic material is converted into an inorganic substance |
| desalination | a process that removes salt from sea water to make it fresh water |
| overpopulation | a condition in which the number of humans grows beyond what the available resources can support |
| conservation | the practice of using less of a resource so that it can last longer |
| pollution | contamination f the Earth's and, water, or air through the release of harmful substances into the environment |
| acid rain | Rain or another form of precipitation that is more acidic than normal. It can react with metal, stone buildings, cars and statues. It can cause rust and weathering of stone. |
| deforestation | the removal of forests to use the land for other reasons |
| desertification | the advance of desert like conditions into areas that were once fertile; caused by overfarming, overgrazing, drought, and climate change |
| sustainable use | the practice of allowing renewable resources time ti recover and replenish |
| climate | the average conditions of temperature, precipitation, winds, and clouds in an area |
| weather | what is going on outside right now...heat or cold, wetness or dryness, calm or storm, clearness or cloudiness |
| polar | a place where the climate usually has a temperature below freezing, is icy, and is covered in snow most of the time |
| temperate marine | mild winter temperatures and warm summers |
| tropical rainy | high warm temperatures and rain fall throughout the yeat usually near the equator |
| dry | climate in which rain does not usually fall |
| greenhouse gases | a gas in Earth's atmosphere that absorbs heat leaving Earth's surface |
| cascade effect | an unforeseen chain of events caused by a disturbance in a system |
| global warming | a gradual increase in the Earth's average temperature |
| greenhouse effect | the trapping of heat near a planet's surface by certain gases in the planet's atmosphere |
| comet | a loose collection of ice and dust that orbits the sun, typically in a long narrow orbit |
| satellite | an object that orbits a planet |
| galaxy | a huge group of single stars, star systems, star clusters, dust, and gad bound together by gravity |
| constellation | a pattern of grouping stars that people imagine to represent a figure or object |
| geocentric | the model of the universe in which the Earth is at the center of the revolving planets and stars |
| heliocentric | the model of the solar system in which Earth and other planets revolve around the sun |
| rotation | the spinning motion of a planet on its axis ( responsible for day/ night) |
| revolution | the movement of an object around another object ( responsible for seasons) |
| gravity | the attractive force between objects |
| full moon | the Earth is located between the sun and the moon...the moon appears fully lit (sun...Earth...moon) |
| new moon | the back side of the moon is being lit up and the side facing the Earth is in darkness (sun...moon...earth) |
| tides | the rise and fall of ocean water |
| eclipse | the partial or total blocking of one object in space by another |
| equinox | there are equal hours of day and night |
| planet | an object that orbits a star, is large enough to have become rounded by its own gravity, and has cleared the area of its orbit |
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rgesmondi
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