Why Are the Rings of Neptune Dark

question 91

Multiple Choice

Why are the rings of Neptune dark?

• A) The small,icy grains of which they are made are transparent and reflect little light back toward Earth.
• B) There are so few of them,making the rings dark even though the individual icy ring particles have high reflectivities.
• C) The ice from which they are made is coated with dark space dust.
• D) The ring material,methane ice,has been darkened by impact by electrons from the magnetosphere.

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Definitions:

Purpose Of The Assessment

The specific objective or reason for conducting an evaluation or measurement, which guides the selection of assessment tools and interpretation of results.

Concurrent Validity

The extent to which test scores correlate with scores from another valid measure taken at the same time.

Criterion-Related Validity

A measure of how well one variable or test predicts an outcome based on information from other variables.

Reliability

The degree to which an assessment tool produces stable and consistent results over time.