Field, laboratory, and library manual in physical geography . o 103 104 PHYSICAL GEOGRAPHY MANUAL other. (See Fig. 13.) Heat a portion of the wire by burning amatch under it. What effect has heat upon iron ? How do ironand brass act upon cooling ? What effect do you suppose heat would have upon a rock ?How would a rock probably act upon cooling ? Do rocks exposedon hillsides suffer change of temperature ? How warm do rocks. Fig. 13. Apparatus for showing the Effect of Heat on Iron Apply a match helow the wire at A and observe themovement of the^lever at B become when subjected to the heat of t
Field, laboratory, and library manual in physical geography . o 103 104 PHYSICAL GEOGRAPHY MANUAL other. (See Fig. 13.) Heat a portion of the wire by burning amatch under it. What effect has heat upon iron ? How do ironand brass act upon cooling ? What effect do you suppose heat would have upon a rock ?How would a rock probably act upon cooling ? Do rocks exposedon hillsides suffer change of temperature ? How warm do rocks. Fig. 13. Apparatus for showing the Effect of Heat on Iron Apply a match helow the wire at A and observe themovement of the^lever at B become when subjected to the heat of the sun during midsum-mer? Do you think the change of temperature from summerto winter would change the length of a rock half a mile inlength? Which would be affected more, layers of rock on thesurface or layers of rock underneath these ? Part II Make a freezing mixture consisting of two parts ice to onepart salt. Allow it to stand until the brine is two or threeinches deep. Fill a small test tube half full of water and put itin the freezing mixture, being careful not to allow any of thesalt or brine to enter the test tube. Be sure that the water linein the test tube is below the level of the brine. Let it standuntil it is frozen. Examine the test tube. What has occurred?Account for this. THE ASSORTING POWER OF WATER 105 Water enters the minute crevices of rocks, fills small cracks,and freezes. What effect must this
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