Describe the hypotheses and the results obtained in the FACE (Free-Air Carbon Dioxide Enrichment) project
What will be an ideal response?
This ambitious project was designed to determine whether forests could be a possible factor in removing and sequestering CO2 in a future challenged by global climate change. To test this hypothesis, forests in several U.S. and international locations were doused with huge amounts of CO2 which simulated a 50% rise in ambient levels. Some of the things learned so far are that elevated CO2 levels increase photosynthesis and tree growth but that the rates of growth eventually slow and level off. The increased biomass still falls to the forest floor where it is metabolized by decomposers, releasing the fixed carbon back into the atmosphere as CO2. Also, the elevated CO2 levels may delay leaf aging, resulting in higher tree mortality from frost damage in winter. Finally, in some cases the insect pests of forest trees tended to increase under experimental conditions.
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Throughout the world, the most water is used for
A. agriculture. B. industrial processes. C. heating and cooling. D. transportation. E. urban uses.
Which of the following statements gives one of the main reasons for warm summers in middle latitudes?
A. The sun is higher in the sky. B. The days are shorter. C. The Earth receives more less solar radiation D. The Earth is far from the sun in summer.
Current flow direction can be determined by cross-beds and some ripple marks. Indicate whether the statement is true or false
A ground fire in a pine forest in southern Florida
A) makes crown fires more likely in the burned regions. B) will cause the permanent extinction of small plants in the burned regions. C) will kill most of the pines in the burned area. D) promotes nutrient cycling in the burned regions.