Loess Deposits in the Central United States and Columbia Plateau

Multiple Choice

Loess deposits in the central United States and Columbia Plateau ________.

A) blew in from the dry areas in the Great Plains and southwestern desert areas
B) originated as silt sized particles in Canadian Pleistocene glacial outwash streams and freshly exposed till
C) accumulated from flooding of the Mississippi River
D) were originally deposited as barchanoid dunes and later redeposited by glaciers