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Grades 5–6 Science Vocabulary

20 essential words with definitions, examples, and quick-check quizzes.

Acceleration
noun
The rate at which velocity changes over time, including speeding up, slowing dow...
Allele
noun
One of two or more versions of a gene that controls a specific trait....
Biome
noun
A large area characterized by its climate and the specific plants and animals th...
Catalyst
noun
A substance that increases the rate of a chemical reaction without being consume...
Chromosome
noun
A thread-like structure of DNA and protein found in cells that carries genetic i...
Diffusion
noun
The movement of particles from an area of high concentration to an area of low c...
Evolution
noun
The gradual change in species over many generations through natural selection....
Gene
noun
A segment of DNA that carries instructions for making a specific protein or trai...
Homeostasis
noun
The process by which living organisms maintain a stable internal environment....
Mitosis
noun
The process by which a cell divides to produce two identical daughter cells....
Natural Selection
noun
The process by which organisms with favorable traits survive and reproduce more ...
Osmosis
noun
The movement of water through a semipermeable membrane from a less concentrated ...
Periodic Table
noun
A chart organizing all known chemical elements by their atomic number and proper...
Photon
noun
A particle of light that carries a specific amount of electromagnetic energy....
Transpiration
noun
The process by which plants release water vapor through their leaves....
Trophic Level
noun
A position in a food chain or web, determined by how organisms get their energy....
Valence Electron
noun
An electron in the outermost shell of an atom that participates in forming chemi...
Compound
noun
A substance formed when two or more elements are chemically bonded together....
Electromagnetic
adjective
Relating to both electric and magnetic fields that together form waves of energy...
Equilibrium
noun
A state of balance between opposing forces or processes....