Answers For The Final Exam

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Answers for the final exam: 1 The following table shows the three laws of thermodynamics and what each of them states: First law Conversation of energy In an isolated system, it is not possible to either create or destroy energy. Second law Energy transfer For an isolated system, the entropy is always increasing. Third law Motion of Molecules As the temperature approaches absolute zero, the entropy of a system assumes a constant value. 2 The origin of universe and elements is recognized to the big bang. The universe and elements that exist created from an explosion that occurred in the past. 3 Heat refers to the amount of energy contained by an object. Temperature, on the other hand, refers to the degree of coldness or hotness of…show more content…
5 Physical weathering occurs when rocks undergo a process that breaks them apart thereby resulting to change in their mechanical form but without any change in their chemical composition. Chemical weathering, on the other hand, refers to the change in chemical form of rocks caused by chemical reactions. Chemical weathering does not impact on the mechanical form of rocks. The chemical weathering results to formation of minerals as it involves chemical reactions that results to formation of new substances. 6 CEC, cation exchange capacity, refers to the measure of soil fertility, its ability to retain nutrients and its capacity to protect the underground water from contamination. Soil buffering, on the other hand, refers to the capacity of soil to use absorption as a mechanism to stop nutrient and pH changes. There is a direct relation between cation exchange capacity and soil buffering. 7 Photosynthesis is the process through which plants use light to produce food. The light used by plants is the sunlight and food is produced in form of sugar. An increase in the rate of photosynthesis results to an increase in the net primary production. 8 From the diagram, it is evident that in the future the temperature is expected to rise. As a result, heat waves mortality is anticipated. 9 Global climate change can affect the organic matter of soil in various ways. For instance, global warming
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