CK12 Life Science

The Nitrogen Cycle Nitrogen is also one of the most abundant elements in living things. It’s important for constructing both pro ...

Figure 24.11: The nitrogen cycle includes assimilation, or uptake of nitrogen by plants; nitrogen-fixing bacteria that make the ...

How does water in the atmosphere return to the ground? What biological process releases carbon back into the atmosphere? What a ...

precipitation Water that falls to the earth in the form of rain, snow, sleet, hail. runoff Water that is not absorbed by the soi ...

relocate. Over time a new community will be established, and then that community may be replaced by another. You may see several ...

Secondary Succession Sometimes ecological succession occurs in places where there is already soil, and that has previously suppo ...

Figure 24.14: The early stages of succession after a forest fire are shown in these pictures. Taken four years after the fire, t ...

Figure 24.16: In 1988, a forest fire destroyed much of Yellowstone National Park. This photo, taken 17 years later, shows that t ...

Figure 24.17: These ancient redwood trees are part of a climax community, the end result of a series of community replacements d ...

Imagine a forest fire destroyed a forest. The forest will slowly re-establish itself, which is an example of what kind of succe ...

(2) http://ecolibrary.cs.brandeis.edu/display.php?id=Succession_four_years_ after_forest_fire_2_DP421. CC-BY. (3) http://www.fli ...

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Chapter 25 Environmental Problems 25.1 Lesson 25.1: Air Pollution Lesson Objectives Discuss the types of outdoor pollution and ...

Figure 25.1: The layers of the atmosphere with altitude. ( 2 ) ...

Introduction Air is all around us and is everywhere and its mix of gases is essential for life. Despite the atmosphere’s vastnes ...

Figure 25.3: A major source of air pollution is the burning of fossil fuels from factories, power plants, and motor vehicles. Ph ...

of fuels in power plants to generate electricity, in factories to make machinery run, in stoves and furnaces for heating, in var ...

Water vapor causes about 36-70% of the greenhouse effect and carbon dioxide causes 9-26%. Fossil fuel burning has produced appro ...

shielded all life from as much as 97-99% of the lethal solar ultraviolet (UV) radiation. How- ever, as a ground-level product of ...

Figure 25.7: The extensive use of asbestos in industrial (as pictured here, asbestos-covered pipes in an oil-refining plant) and ...