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ACT Science2
| Term | Definition |
|---|---|
| atmosphere | a gaseous envelope that encloses a celestial body |
| Big Bang | the theoretical origin of the universe that it was created when a sudden expansion from a single point infinite density |
| ecosystem | a community of organisms and their environment |
| gas | a fluid having neither shape nor volume and tending to expand indefinitly |
| heteroptrophs | an organism that requires organic compounds of carbon and nitrogen for it metabolic processes |
| mantle | the part of the Earth below the crust and outside of the core. |
| crust | the outer layer of a planet or moon |
| core | the central part of a planet, moon or star |
| neutrons | a particle without a charge that forms a part of all atoms. |
| protons | a positively charged particle that forms part of the nuclei of all atoms |
| electrons | a negatively charged particle |
| rotation | the movement of a celestial body around a central axis |
| universe | the entire body of matter or phenomena |
| equilibrium | a state of balance between opposing forces |
| half-life | the time in which half of the atoms of a radioactive substance disintrigates |
| molecule | the smallest unit of a substance composed of more than one atom. |
| nucleus | controls all the functions of the cell |
| regeneration | the replacement of a body part through growth of new tissue |
| turgor | the normal distention of cells caused by pressure |
| evolution | the development of a species over history including genetic modifications |
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