Exam 12: Global Biogeochemical Cycles and Their Alteration by Humans

Prior to the Industrial Revolution,what was the level of atmospheric carbon dioxide,and what is the current level?

If you conducted a whole-ecosystem experiment and manipulated temperature,which of the following would you expect to happen?

What most explains the flux of carbon dioxide into the atmosphere from 1960 to present?

The use of high-volume hydraulic fracturing techniques to release natural gas from shale is of major concern because ____________.

How many degrees Celsius was the global average temperature in 2011 above the long-term average from the early 20th century?

Anthropogenic sources of methane include which of the following?

Which of the following are considered life-sustaining biophysical systems,as proposed by Rockstrom et al.?

Why do ocean waters become acidic as carbon dioxide is assimilated?

In Figure 12.5,prior to 1850,the global flux of carbon dioxide to the atmosphere due to fossil fuel emissions was close to zero.However,in the late 19th century,an increase can be observed.From 1900 to 2010,what has occurred with the global flux of carbon dioxide due to fossil fuel emissions?

If you used a whole-ecosystem experiment to add carbon dioxide to forests,what effect would you expect these additional amounts of carbon dioxide to have?

Amphibian disease may be related to fertilizer production because?

One reason why the melting of oceanic ice will potentially be problematic for the atmosphere and global warming is _____________.

In the 1960s,sulfur pollution in North America and Europe was a major cause of acid rain.Though sulfur pollution has been reduced due to regulation,pollution due to which compound appears to contribute to acid rain formation today?

How has human activity since the 19th century affected atmospheric concentrations of methane?

Prior to 1900,what was the major source of atmospheric carbon dioxide?

Phosphorus cycles within ecosystems,but the vast majority of phosphorus is stored where?

Using Figure 12.3,which of the following statements is accurate regarding the concentration of Earth's atmospheric carbon dioxide through time?

Which of the following statements regarding methane as a greenhouse gas are correct?

Where is acid rain most recently becoming a major environmental problem?

You are researching a biotic process that controls the chemistry of the environment and your colleague is studying how the structure and function of that same ecosystem is controlled by geochemical processes.What field of science are you both working in?