What characterizes a composite sample?

A composite sample is characterized by being created through the combination of individual samples collected at specific intervals or locations over a period of time. This method is used to provide a more representative overview of the variability in a certain area or process, as it integrates data from multiple points, thus mitigating the impact of any anomalies that may occur in a single sample.

This approach is particularly useful in environmental monitoring, quality control, and any context where variations may be significant. By averaging the results of the combined samples, the analysis reflects an overall trend rather than isolated results that may not represent the entire system or area being studied.

The other aspects mentioned in the other choices do not align with the definition of a composite sample. A composite sample does not come from just one location and is not limited to containing a single type of contaminant; rather, it can encompass a variety of substances depending on what is being measured. Additionally, there is no strict requirement for composite samples to be collected in large quantities; rather, the focus is on the methodological aggregation of samples.