Primary sources can be described as those sources that are closest to the origin of the information. They contain raw information and thus, must be interpreted by researchers. Secondary sources are closely related to primary sources and often interpret them.
It keeps us from flying into outerspace.
Earthquakes usually happen when a plate underground rubs together.
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Answer:
To describe and summarize spatial data. To make generalizations concerning complex spatial patterns, to use samples of geographic data to infer characteristics for a larger set of geographic data (population).
Explanation:
