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ACT Science2

TermDefinition
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
Created by: JasperACTprep
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