2. Describe the change in atmospheric CO2 over the past 800,000 years. What is t

Question

2. Describe the change in atmospheric CO2 over the past 800,000 years. What is the Keeling Curve? Where do its measurements put us today in relation to the past 50 years?

3. Describe an example of a climate proxy used in the study of paleoclimatology.

4. Explain how oxygen isotopes can identify glacials and interglacials.

5. Define a climate feedback, and describe an example of a feedback loop.

6. Explain the principle of uniformitarianism in the Earth sciences.

7. Describe the asthenosphere. Why is it also known as the plastic layer? What are the consequences of its convection currents?

8. Explain what coarse- and fine-grained textures say about the cooling history of a rock.

9. What is metamorphism, and how are metamorphic rocks produced? Name some original parent rocks and their metamorphic equivalents.

10. Characterize the three types of plate boundaries and the actions associated with each type.

Explanation / Answer

2.The last time the Earth experienced a comparable concentration of CO2 was 3-5 million years ago. Back then, the temperature was 3°C warmer.in the current time it is recahed at its highest level in 800000 years. The increase in concentrations of greenhouse gases in the atmosphere commenced in the industrial age, which began in 1750. This was down to a range of factors including population growth, as well as industrialization and its use of fossil fuel source, it is continuing till now and especially in last three decade it rose dramatically.

Keeling curve:it looks the measurement of CO2 in the atmosphere on a mountain in Hawaii for the past 50 or so years. The scientific way to fit a line to the curve would be to get a table of points on the curve and the use a calculator to find the least squares regression on those points.

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