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Migration of Sand Grains to Form Ripples, Dunes, and Crossbeds
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1
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What is the mechanism by which a dune or a ripple migrates?
A)sand is eroded from the lee face of the dune and deposited on the slip face
B)sand is eroded from the slip face of the dune and deposited on the lee face
C)wind or water pushes the dune, which slides along the surface
D)gravity pulls the dune, which slides along the surface
E)sand is eroded by wind or water, then falls out of suspension to form a dune
2
Which process best describes the movement of sand up the lee face of a dune or ripple?
A)suspension
B)levitation
C)saltation
D)induction
E)traction
3
What is the orientation of the dip in cross beds relative to the direction of migration of the ripple?
A)cross beds dip randomly relative to the direction of ripple migration
B)cross beds dip toward the direction of ripple migration
C)cross beds dip away from the direction of ripple migration
D)cross beds are horizontal
E)cross beds are vertical





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