Author Question: By the end of the Permian, the Absaroka Sea had retreated from the craton, exposing what type of ... (Read 75 times)

Evvie72 · **on:** Jul 13, 2018

By the end of the Permian, the Absaroka Sea had retreated from the craton, exposing what type of deposits?
A)evaporite
B)black shale
C)volcanic
D)red bed
E)reef

Question 2

What is a cone of depression, where is it found, and what causes it? Why can large cones of depression be a serious problem?

Ahernandez18 · **Reply #1 on:** Jul 13, 2018

Answer to Question 1

D

Answer to Question 2

A cone of depression is where the water table is lower in a cone shape in the area around a well. It is caused by excess groundwater pumping; that is when discharge from a water well exceeds recharge or the rate of groundwater flow. Large cones of depression are a problem because they can cause shallow wells in the immediate vicinity to go dry.