Why Are the Rings of Neptune Dark

question 58

Multiple Choice

Why are the rings of Neptune dark?

• A) Although the particles have highly reflective surfaces, there are very few particles in the rings.
• B) The rings are composed of small, dark rock particles.
• C) The particles are composed of methane ice that has been darkened by radiation damage.
• D) The particles have highly reflective surfaces, but the rings are far from the Sun, where there is little light.

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Definitions:

Pretest Impact

The influence that prior testing might have on the participants' subsequent performance on a posttest, affecting the interpretation of an intervention's effect.

Posttest Scores

The scores obtained from tests administered after an experimental treatment or intervention to evaluate its effects.

Independent Groups Design

A research design in which different groups of participants are exposed to different conditions or levels of the independent variable.

Variable Manipulation

The process of intentionally changing variables to test their effects in an experiment.