The image below shows a beam of radiation passing between two electrically charged plates. 
Which of the beams is actually composed of particles?
A. a
B. b
C. c
D. a and c
E. all of the above
Answer: D
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Increases in ozone in the upper atmosphere may lead to increased occurrence of skin cancer.
Answer the following statement true (T) or false (F)
Which of the following igneous rocks can be composed of fragments?
A. scoria B. volcanic breccia C. tuff D. All of these choices are correct.
Which type of plate margin is characterized by volcanos that include basalt, andesite, dacite and rhyolite?
A) hot spots B) transform faults C) spreading ridges D) convergent plate margins
Examine the diagram below, which is a diagrammatic sketch of geologic features exposed in cross section in a deep river canyon
Write a paragraph that summarizes the geologic history at this locality, using the letter labels to describe the different rock units. Your history should be chronological, starting with the first event and ending with the most recent. Identify unconformities where they exist. What will be an ideal response?