Shared Flashcard Set

Details

PSSA Word of the Day #1-30
First 30 PSSA Science Words
30
Science
8th Grade
10/22/2007

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Cards

Term
Natural Selection
Definition
the process whereby some organisms in a species have certain characterisitics inherited that give them an advantage over other species
Term
Inquiry
Definition
a search for knowledge - a systematic investigation to solve a problem
Term
Hibernation
Definition
period of time when an animal becomes dormant especially during the winter months
Term
Parent Material
Definition
material from which the soil comes
Term
Evaporation
Definition
The process by which a liquid changes into a gas
Term
Energy
Definition
The capacity to do work
Term
Phase change
Definition
A change in the physical state of a substance from solid to liquid, liquid to gas, or solid to gas
Term
Moon Phase
Definition
The appearance presented by the Moon as seen from Earth determined by the portion of the Moon that is visibly illuminated by the Sun
Term
Rotation
Definition
Spinning motion of a body about an axis
Term
Sexual Reproduction
Definition
Reproduction involving two parents
Term
Model
Definition
A physical representation of some thing; that thing may be a single item or object
Term
Ecosystem
Definition
A system made up of a community of animals, plants and bacteria and its interrelated physical and chemical environment
Term

Fact

Definition
Something proven to be true
Term
Diffusion
Definition
The movement of a substance from an area of high concentration to an area of low concentration.
Term
Mutation
Definition
A change in a hereditary characteristic that produces a new trait which can be inherited.
Term
Life Span
Definition
The longest period of life reached by a type of organism
Term
Adaptation
Definition
A change over time in an organism’s structure or function that helps it better survive in its environment
Term
Gene
Definition
The basic unit of heredity
Term
Calibration
Definition
Determination of the accuracy of an instrument
Term
Humus
Definition
Brown or black, partially decomposed plant or animal material that forms the organic portion of soil
Term
Incineration
Definition
The controlled combustion of materials at high temperatures.
Term
Radiation
Definition
Energy released in the form of particles or electromagnetic waves.
Term
Plate Tectonics
Definition
The theory that the earth's surface is divided into a few large, thick plates that are continually moving
Term
Scale
Definition
The ratio between the size of something and a representation of it.
Term
Hydraulics
Definition
A branch of science and engineering concerned with the use of liquids to perform mechanical tasks - fluid power
Term
Weather
Definition
The state of the atmosphere with respect to heat or cold, wettness or dryness, calm or storm, clearness or cloudiness
Term
Evidence
Definition
any information that tends to prove something
Term
Law
Definition
A rule about the natural world
Term
Vaporization
Definition
The change from liquid or solid phase to vapor phase
Term
Trophic Level
Definition
The energy level or steps in a food chain or food web
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