Pegmatites,which Occur in Dikes,are Unusual Among Shallow Intrusive Rocks in That

question 21

Multiple Choice

Pegmatites,which occur in dikes,are unusual among shallow intrusive rocks in that they ____________.

• A)possess porphyritic texture
• B)possess exceptionally coarse grains
• C)are mineralogically identical to the extrusive rock basalt
• D)are glassy,cooling so rapidly that crystals do not have time to form

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Definitions:

Shape

In chemistry, this often refers to the geometric arrangement of atoms in molecules or the spatial form of a molecule.

Electron Orbital

A mathematical function that describes the wave-like behavior of either one electron or a pair of electrons in an atom.

Energy Level

An energy level is a quantized state of energy that an electron can occupy in an atom, related to the electron's position and movement.

D Orbitals

Refers to a set of orbitals in an atom that have a distinctive shape and can hold up to 10 electrons, important in the distribution of electrons in atoms.