Global Biogeochemical Cycles And Their Alteration By Humans - Essentials of Ecology

The rate of phosphorous flow through the global environment is three times faster now than before the industrial and agricultural revolutions.The main problem with this accelerated cycle is that?

A) It results in acidification of the oceans
B) It causes drastica alteration of ocean currents
C) It causes eutrophication of freshwater lakes
D) It initially slows the growth of freshwater vegetation

Answer

Question 2

(Multiple Choice)

Free

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

A) Below 265 ppm pre Industrial Revolution; 200 ppm in 2014
B) Below 200 ppm pre Industrial Revolution; 4,000 ppm in 2014
C) Below 265 pre Industrial Revolution; 398 ppm in 2014
D) Below 200 ppm pre Industrial Revolution; 30,000 ppm in 2014

Answer

Question 3

(Multiple Choice)

Free

What action by humans has most accelerated the phosphorus cycle?

A) Using cleaning agents that contain phosphorus compounds
B) Clear cutting forests
C) Mining phosphorus for fertilizer
D) Ocean acidification that has increased the proportion of phosphorus bound to sediments

Answer