The following material will test your grasp of the material covered in this lesson. There is only one
correct answer for each item. When you have completed the exercise, check your answers with
the answer key that follows. If you answer any item incorrectly, study again that part of the lesson
which contains the portion involved.
Which color reveals gravel on a black and white photo?
A. Black to dark grey.
B. Dark grey to light grey.
C. Mid grey to light grey.
D. Light grey to white.
Which of the following solids are extracted by drilling?
Which extraction method is used in Figure 2-33?
A. Open pit mining.
B. Shaft mining.