Dunes That Form When Vegetation Cover Is Broken by Deflation

question 15

Multiple Choice

Dunes that form when vegetation cover is broken by deflation and the dune tips point upwind are:

• A) longitudinal.
• B) transverse.
• C) barchan.
• D) parabolic.
• E) none of the above

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Definitions:

Nucleophile

A chemical species that donates an electron pair to form a chemical bond in relation to a reaction.

Lewis Base

A substance that can donate a pair of electrons to form a covalent bond, according to Lewis acid-base theory.

Electrophile

A reactive species that seeks out electrons and is attracted to electron-rich sites, often participating in chemical reactions by accepting an electron pair.

Nucleophile

An entity in chemistry that transfers a pair of electrons to an electrophile, enabling the formation of a chemical bond as a part of the reaction process.