What does the shape of a uranium roll-front deposit record?
A)folding of beds in a sandstone
B)folding of quartzite derived from a sandstone
C)the boundary between two types of groundwater
D)the rolling of the front of a sandstone bed

Question

What does the shape of a uranium roll-front deposit record? 
A)folding of beds in a sandstone 
B)folding of quartzite derived from a sandstone 
C)the boundary between two types of groundwater 
D)the rolling of the front of a sandstone bed

Quizplus · Accepted Answer

The shape of a uranium roll-front deposit records the boundary between two types of groundwater. The uranium mineralization occurs where an oxidizing zone of groundwater meets a reducing zone of groundwater, forming a roll-front shape. This mineralization can accumulate in sandstone or other sedimentary rocks that were deposited in a shallow marine or terrestrial environment.

What Does the Shape of a Uranium Roll-Front Deposit Record