Frost Wedging Is Most Effective __ $\degree$ C at Night and Above 0

question 39

Multiple Choice

Frost wedging is most effective __.

• A) in areas with many days of freezing and thawing
• B) in the winter when the rock is frozen solid for months on end
• C) in the spring and fall in very dry desert areas where temperatures dip down below 0\(\degree\)C at night and above 0\(\degree\)C during the day
• D) in the summer when abundant rainfall percolates through the cracks to freeze in contact with the very cold rock found deep below the surface

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Definitions:

Saccades

Rapid, abrupt movements of the eyes that abruptly change the point of fixation.

Voluntary Fixation

A consciously controlled process of stabilizing focus on a particular stationary or moving object.

EOG

Electrooculography, a technique for measuring the corneo-retinal standing potential that exists between the front and the back of the human eye.

Snellen Eye Chart

A chart used to measure visual acuity, consisting of rows of letters decreasing in size, which is read from a standard distance.