The Gems Sapphire and Ruby Are Two Varieties of the Mineral

question 34

Multiple Choice

The gems sapphire and ruby are two varieties of the mineral corundum (Al₂O₃) .Considering the Mohs hardness of corundum,which mineral listed below would be able to scratch the gems sapphire and ruby?

• A) quartz
• B) feldspar
• C) topaz
• D) diamond

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Definitions:

Receptive Vocabularies

The set of words a person understands when heard or read, as opposed to expressive vocabulary, which consists of words a person uses in speech or writing.

Productive Vocabularies

The set of words a person can actively produce or use in appropriate contexts, often contrasted with receptive vocabulary, which includes words a person can understand but might not actively use.

Speech Impediment

Any condition that affects the ability to produce clear and understandable speech, including stuttering, lisping, and dysarthria.

Overextension

The application of a word or concept beyond its usual associated contexts, often occurring in the language development of children.