The Source of the Water Found in the Form of Ice

question 226

Multiple Choice

The source of the water found in the form of ice near Mercury's north and south poles is

• A) comet impacts.
• B) unknown at the present time.
• C) rainfall early in Mercury's history, when the planet had a dense atmosphere.
• D) a former global ocean, now almost entirely evaporated and lost to space.

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Definitions:

Sequential Study

Study design that combines cross-sectional and longitudinal techniques.

Longitudinal

Pertains to research or studies that observe the same subjects over a period of time, often to detect changes or developments.

Cross-sectional

A research design that looks at data from a population at a single point in time to identify patterns and associations.

Sequential

Pertaining to events, processes, or items that follow one after another in a specific order.