We Know from the Apollo Missions and Unmanned Probes That

question 8

Multiple Choice

We know from the Apollo missions and unmanned probes that the Moon's surface is covered with loose, unconsolidated material with a texture similar to soil on earth. How did this material form on the Moon?

• A) The material is mostly volcanic ash ejected from volcanos that are no longer active.
• B) The same as Earth, but soils are ancient from a time when the moon still had an atmosphere and water.
• C) The material is produced by spalling from rock surfaces caused by the extreme heat- cold cycles as the moon rotates through a 1 lunar day, or approximately one Earth month.
• D) The loose material is mostly micrometeorite fragments and ejecta from impact craters, so is very different from soil on Earth.

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Definitions:

Natural Context

The original or genuine environment in which a subject or phenomenon naturally occurs, without artificial interference.

Independent Variable

The variable that is intentionally changed by the researcher in an experiment to see if it produces an effect.

Internal Validity

Refers to how well a study is conducted, specifically whether it establishes a causal relationship between variables.

Causal Relationship

A connection between variables where a change in one directly influences the change in another.