One Side of a Sand Dune Is Typically Steeper Than

question 94

Multiple Choice

One side of a sand dune is typically steeper than the other side.The steepest slope is controlled by the angle of repose for sand and most materials,which is about

• A)5°.
• B)15°.
• C)34°.
• D)78°.
• E)89°.

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Definitions:

Myelin Sheath

The fatty layer that surrounds and insulates the axons of some neurons, which enables faster transmission of electrical impulses.

Neurotransmitters

Chemicals that transmit signals across a synapse from one neuron to another neuron, muscle cell, or gland cell.

Synaptic Vesicle

Membrane-bound sacs in the presynaptic terminals of neurons that store neurotransmitters, which are released into the synaptic cleft in response to an action potential.

Axon

A long, slender projection of a nerve cell, or neuron, that conducts electrical impulses away from the neuron's cell body.