1. Use your own words to answer the following questions: The amount of carbon di
ID: 294702 • Letter: 1
Question
1. Use your own words to answer the following questions:
The amount of carbon dioxide in the atmosphere has increased in recent years. What processes do scientists suggest this change is a direct result of?
Describe scientific evidence that supports the concept of climate change.
Explain the advantages of a three-phase voltage system over a single-phase system.
Which of the following greenhouse gases is entirely anthropogenic in origin?
Select one:
a. methane
b. carbon dioxide
c. nitrous oxide
d. water vapor
e. CFCs
What do climate models do?
Select one:
a. are based on our understanding of ancient climate
b. project the future of the Earth's climate, depending on future actions to prevent greenhouse-gas emissions
c. are as accurate and reliable as a daily weather forecast
d. predict a rise in temperature of at least 4?C, or almost 40?F, by the end of this century
e. all of the above
Explanation / Answer
1) major source of carbon dioxide is the burning of fossil fuels and industrial emissions, that increased the emission of CO2 in to the atmosphere, and also decrease of forest area considerably reduced the amount of carbon sequestration.
Q) the rise in global temperature is the major indication of climate change, our polar ice caps and glaciers star to melt, and the sea level is rising, there are many islands in pacific ocean which are already threaten by this sea level rise.
Q) the three phase voltage system provides constant power but single phase is pulsating,
parallel operation is not possible in single phase but in the three phase it is possible
efficiency of single phase is less than the three phase motor.
three phase voltage have high power factor than single phase.
Q) CFC (chloro fluoro carbon
it is entirely anthropogenic in origin
Q)project the future of the Earth's climate, depending on future actions to prevent greenhouse-gas emissions
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