Explain how water can cause mechanical weathering
What will be an ideal response?
Water can cause mechanical weathering by freezing in the pore spaces and fractures within rock. When it freezes, it expands, gradually pushing apart the space or fracture, which allows for more water to fill in and freeze and continue the effect. This is called frost wedging. Water is the most important agent of chemical weathering. Oxygen dissolved in water can oxidize (rust) materials—this is oxidation. Carbon dioxide dissolved in water creates carbonic acid, which readily dissolves some rock—this is dissolution. Further, carbonic acid reacts with some rock and replaces ions, most often potassium ions, with hydrogen ions, transforming rock into clay—this is hydrolysis.
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Which of the following contains the most freshwater?
A. aquifers B. streams C. lakes D. rivers
Jointing in rocks is characterized by..
a.) the hinge lines connecting two limbs of an anticline or syncline b.) closely spaced, parallel faults along which the blocks have moved in opposite directions c.) structures formed where normal and reverse faults intersect d.) roughly parallel fractures separating blocks that show no displacement
_________ found in the Atlantic Ocean between North America and Europe is composed of dense and relatively young rock.
Fill in the blank(s) with the appropriate word(s).
What is the population in Canada likely to experience soon?
A) Government institution of a population control policy B) Exponential population growth C) More senior citizens D) More single males