Geologists determine the geological history of an area by examining rock
layers in geologic columns. The diagram
shows three geologic columns from the
same region that have not been
overturned
A Place an arrow at each rock layer
boundary to represent a missing layer
of rock in each of the three columns
В.
Select the oldest rock layer
represented in the group of geologic
columns
• You may use the arrow more than once.
• There may be more than one correct
answer