Field, laboratory, and library manual in physical geography . omthe siphon, and then adjust the pincheoek EXERCISE LIIIVEINS How are rocks fractured ? (See Exercise XXXI; also Topic35, Causes of Mountains, p. 16, and Topic 62, Earthquakes,p. 27.) How deep into the earth do cracks and fissures extend?Underground water may follow these fissures wherever they 138 PHYSICAL GEOGRAPHY MANUAL go. As water descends to great depths what change of tempera-ture does it undergo ? What effect does this change of tempera-ture have upon its ability to dissolve rocks ? (See Exercise LII.)If water is thoroughl
Field, laboratory, and library manual in physical geography . omthe siphon, and then adjust the pincheoek EXERCISE LIIIVEINS How are rocks fractured ? (See Exercise XXXI; also Topic35, Causes of Mountains, p. 16, and Topic 62, Earthquakes,p. 27.) How deep into the earth do cracks and fissures extend?Underground water may follow these fissures wherever they 138 PHYSICAL GEOGRAPHY MANUAL go. As water descends to great depths what change of tempera-ture does it undergo ? What effect does this change of tempera-ture have upon its ability to dissolve rocks ? (See Exercise LII.)If water is thoroughly saturated with material in solution, whateffect will be produced by cooling it? This is the process bywhich cracks and fissures in the rocks are filled. What materialsmay be dissolved by water ? Why are veins of interest to theminer? Distinguish between the manner of formation of veinsand dikes. (See Topic 61, Volcanic Phenomena, p. 26.) Examine veins in a cliff or in specimens which you have inthe laboratory. What kind of material do you find in the rock. JFig. 28. A Rock with Intersecting Veins which contains the veins ? Of what kind of material are the veinscomposed ? Which is harder, the veins or the rock in which theyoccur? Which will wear away faster when subjected to theaction of the weather? Give the width of the widest vein whichyou find; of the narrowest. Are the veins which you find inany one cliff of equal age ? Give reason for your answer. Illustrate by drawings what you see, showing as many factsaspossible about veins. DENSITY AND TEMPERATURE OF SEA WATER 139 EXERCISE LIV DENSITY AND TEMPERATURE OF SEA WATER Part I Weigh accurately about 100 grams of sea water. Boil andevaporate to dryness. Weigh the residue and calculate the per-centage of solid matter. From the books determine what partof the solid matter is common salt (chloride of sodium). Accord-ing to this, how much common salt in 100 pounds of sea water? Part II Temperature Density Bay Ocean Bay Ocean Jul
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