Describe the Difference Between a Source, Sink, and Reservoir of an Element

question 66

Essay

Describe the difference between a source, sink, and reservoir of an element.

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Definitions:

Internal Validity

The extent to which a study provides evidence that a causal relationship exists between the variables it examines, free from confounding factors.

Random Assignment

Use of a random "chance" procedure (such as a random number generator or coin toss) to determine the condition in which an individual will participate.

Confounding Variable

A factor other than the independent variable that might produce an effect in an experiment, leading to inaccurate results if not controlled.

Independent Variable

The variable that is changed or controlled in a scientific experiment to test the effects on the dependent variable.