Barrons AP Environmental Science

Four factors that control the severity of forest fires are: ■ Weather ■ An abundance of fuel (combustible ...

advantages are that they burn away flammable ground litter; reduce larger fires later; release minerals ba ...

grow more quickly. Fire also helps destroy invasive plant species that compete for limited resources. R ...

Figure 7.6 Deforestation in the United States (1620–present) Methods Used to Manage and Harvest Trees Figure 7.7 Eve ...

long times of no wood availability Reduction in both long-term (old-growth forests) and short-term carbon ...

Tree Plantations Pros Cons Practical method for trees that require full or moderate sunlight in order to gro ...

habitats. ■ Grow timber on longer rotations. ■ Reduce or eliminate clear-cutting, shelterwood cutting, and seed-tr ...

The Hubbard Brook Experimental Forest centered on how deforestation affects nutrient cycles. The forest consisted ...

valuable grazing lands for livestock and wildlife. Rangelands serve as a source of high-quality water, clean ...

wildlife. Livestock grazing is the fifth-rated threat to endangered plant species, the fourth leading threat for all ...

Figure 7.10 Desertification vulnerability Overgrazing The consequences of overgrazing and its effect on sustainability ...

cattle wastes. Therefore, aquatic environments are also negatively impacted. Predator-prey relationships ...

Urbanization refers to the movement of people from rural areas to cities and the changes that accompany ...

Uses less land—less impact on the environment. Impact on land is more concentrated and more pronounced. Examp ...

for buying a home, companies moving and/or expanding where there is more land available with workers fol ...

advocates compact, transit-oriented, walkable, bicycle-friendly land use, neighborhood schools, and m ...

■ FEWER POLLUTANTS—Vehicles caught in stop-and-go traffic emit far more pollutants, particularly carbon monoxide, nit ...

Roadless Areas and Ecosystem Impacts Roadless areas are places where no roads have been built and wher ...

numbers of visitors, which leads to congestion, eroded trails, noise that disrupts wildlife, and pollution ...

Wildlife Refuges President Theodore Roosevelt designated 4-acre (1.6 ha) Pelican Island, off Florida ...