Gemstones Are Commonly Found in Pegmatites,which Are Igneous Rocks That

question 25

Multiple Choice

Gemstones are commonly found in pegmatites,which are igneous rocks that are ________.

• A)exceptionally mafic
• B)extrusive,forming from lava
• C)exceptionally coarse grained
• D)exceptionally fine grained

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Definitions:

Glaucoma

A group of eye conditions that can cause blindness due to damage to the optic nerve, often associated with high intraocular pressure.

Aqueous Humor

A liquid produced by the eye’s ciliary body that fills the space between the cornea and the lens.

Amblyopia

Often referred to as "lazy eye," a vision development disorder where an eye fails to achieve normal visual acuity, usually due to poor eye coordination or focusing.

Conjunctivitis

An inflammation of the conjunctiva, the mucous membrane covering the white part of the eyes and the inner side of the eyelids.