Answer:
Caprock
Explanation:
Texas is divided into four regions. North central plains are a region of Texas which is largest region. There is a bed of rocks known as Caprock below the soil. Caprock prevents the flow of any water or oil from below and these does not reach the soil. These rocks are harder and more resistant type of rocks.
Try reading the first paragraph of this. It may help. https://books.google.com/books?id=IQwAAAAAMBAJ&pg=PA2&lpg=PA2&dq=How+does+columbus+and+smith+deploy+...
