The Purpose of Rubbing a Mineral Across an Unglazed Porcelain

question 44

Multiple Choice

The purpose of rubbing a mineral across an unglazed porcelain slab, the streak plate, is:

• A) to remove dirt and corrosion from the mineral so that its true color can be observed.
• B) to observe the color of a mineral in its powdered form.
• C) to remove the atoms of trace impurities that may exist within the structure of the mineral.
• D) to determine if a streak will form on the mineral.

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Definitions:

Coordination

The ability to use different parts of the body smoothly and efficiently together, often important for physical activities and sports.

Intentionality

The quality of being deliberate or purposeful in actions, thoughts, or communications.

Coordination

The ability to use different parts of the body together smoothly and efficiently.

Secondary Circular Reactions

A stage in Piaget's theory of cognitive development, where infants repeat actions to trigger reactions in their environment, aiding in the understanding of cause and effect.