Why are drain holes an essential part of a retaining wall? What will be an ideal response?
Without them, water will build up behind the wall. This water increases the weight of the slope
material, and more importantly, the water pressure can exert tremendous force on the wall, causing it
to fail.
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There is good evidence that variation in solar energy, as evinced by sunspot activity cycles, is responsible for short-term climatic variations
Indicate whether the statement is true or false
Which of the following is an example of a relative date?
A) The Cenozoic era began sixty-five million years ago. B) A headstone in a cemetery has the date a person died. C) The Declaration of Independence was written in 1776. D) The Silurian period came before the Devonian period.
What is so unique about the Appalachian culture?
Glaciers erode by the processes of ____
a. ablation and abrasion b. plucking and hydraulic action c. deflation and saltation d. plucking and abrasion