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7. Which of the following is not an agent of erosion? A. glacier B. rocks C. water D. wind 8. Which of the following cannot be considered as a role of gravity in erosion? A. It moves glaciers down slope.B. It loosens the land materials, c. In mountains, it moves down large slabs of rocks. D. It acts as agents of mass wasting like landslides, fall, mudflows, and avalanches, 9. What term refers to the process wherein rocks break down into pieces? A. deposition B. erosion C. mass wasting D. weathering 10. What process of chemical weathering is involved when water reacts with one mineral to form a new mineral like feldspar into clay? A. dissolution B. hydrolysis C. oxidation D. pressure 11. What type of mechanical weathering occurs when freezing of water and repeated thawing in cracks of rocks? A. abrasion B. frost wedging C. oxidation D. solution 12. Which of the following does NOT cause chemical changes in the composition of rocks? A. abrasion B. dissolution C. hydrolysis D. oxidation 13. What chemical reaction takes place during rusting of iron? A. abrasion B. dissolution C. hydrolysisD. oxidation

Sagot :

7 A. glacier, 8 B It loosen the land material, 9 D Weathering, 10 B Hydrolysis 11 B Frost wedging, 12 A abrasion,13 D oxidation.

Any chemical reaction in which a water molecule breaks one or more chemical bonds is called hydrolysis (/hadrlss/; from the Ancient Greek hydro-, "water," and lysis, "to unbind"). When water is the nucleophile, the phrase is used generically to refer to substitution, elimination, and solvation processes. The cleavage of biomolecules known as biological hydrolysis occurs when a water molecule is consumed in order to cause the division of a bigger molecule into its component parts. Saccharification is the process of hydrolyzing a carbohydrate into its individual sugar molecules, as occurs when sucrose is broken down into glucose and fructose.

A condensation. reaction, in which two molecules. combine to form a bigger. one and expel. a water molecule, can be reversed. by a hydrolysis. reaction. In order to break down, hydrolysis adds water.

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