Volcanic Ash Flows Remain Close to the Ground, but They

question 9

True/False

Volcanic ash flows remain close to the ground, but they can travel downhill from the volcano summit very quickly, up to 150 kilometers (90 miles) per hour, incinerating anything in their path as they roar down the slope.

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Definitions:

Separate Control Group

A group in an experiment that is not exposed to the treatment or intervention and is used as a benchmark to measure the effects of such treatment.

Regression Toward the Mean

The statistical phenomenon that high or low scores naturally tend to move closer to the average over time.

Extreme Scores

Values in a data set that are significantly higher or lower than the majority of the other scores, potentially skewing results.

Less Extreme

Refers to measures or values that are closer to the average or mean in a distribution, as opposed to being more extreme or far from the average.