Large Crystals Found in a Fine-Grained Groundmass Can Indicate What

question 25

Multiple Choice

Large crystals found in a fine-grained groundmass can indicate what?

• A) origin from a magma with an early intrusive phase followed by an extrusive phase
• B) origin from a magma with an early extrusive phase followed by an intrusive phase
• C) a rock of mixed volcanic-plutonic origin
• D) intrusive slow cooling
• E) origin from a magma with an early intrusive phase followed by an extrusive phase; a rock of mixed volcanic-plutonic origin

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Definitions:

Derived

Obtained from a specific source or originating from something; made by altering or modifying something else.

Ectoderm

is the outermost layer of cells or tissue of an embryo in early development, giving rise to the epidermis and nervous system.

Notochord

A pliable stick-like structure composed of a substance akin to cartilage, offering support within all embryonic and certain adult members of the chordate group.

Dorsal Supporting Rod

A skeletal structure found in all chordates that provides axial support, better known as the notochord in embryonic stages.