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Human alteration of biogeochemical cycles — Homework
Show your percent-change work for every calculation.
- 1.Atmospheric CO2 was about 280 ppm before industrialization and is about 420 ppm today. Calculate the percent increase.
- 2.A farm applies 150 kg of nitrogen fertilizer, and 20% runs off in a storm. How many kg enter the local waterway?
- 3.Explain why the Keeling Curve shows a small yearly zig-zag even as its long-term trend rises steadily.
- 4.Explain the connection between rising atmospheric CO2 and a change in ocean chemistry.
- 5.Explain why this week is described as a "bridge" connecting the nitrogen/carbon cycles unit to later units on water pollution and climate.
🌲 Homeschool of the FutureTwelfth Grade · Science · week 9 homework