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A(n)________ spectrum is created by a glowing, hot thin gas, such as M-42 in Orion.
Positive Correlation
A relationship between two variables where an increase in one variable is associated with an increase in the other.
Independent Variable
In research, a variable that is manipulated or changed to observe its effects on a dependent variable.
Experimental Method
A scientific procedure undertaken to make a discovery, test a hypothesis, or demonstrate a known fact.
Independent Variable
The variable in an experiment that is manipulated to observe its effect on a dependent variable.
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