Key Concepts:

The principal causes of deforestation are illegal logging, kaingin farming, forest fires, and conversion of agricultural lands to housing projects and typhoons.

The effects of deforestation include soil erosion, floods and depletion of wildlife resources.

The major cause of wildlife extinction is the loss of habitat.

Coral reef destruction is caused by dynamite fishing and muro ami, while mangrove destruction is caused by overharvesting and conversion of the area into other uses.

In eutrophication, nutrients are washed away from the land to enrich bodies of water. It causes excessive growth of aquatic plants and algae and results in algal bloom, which eventually die and decompose. The process depletes the oxygen dissolved in water, causing fish and other aquatic organisms to die.

Acid rain is a result of air pollution mostly from factories and motor vehicles.

Sustainable development means that a society should live under the carrying capacity of the environment.

Summary Population is a group of organisms of the same species living in a certain place.

Biodiversity refers to the variety of life in an area.

Communities with many different species (a high index of diversity) will be able to withstand environmental changes better than communities with only a few species (a low index of diversity). Population sizes vary among organisms. They change with the number of births and when they move into an ecosystem. They also change when members die or move out of an ecosystem.

Limiting factors are environmental conditions that keep a population from increasing in size and help balance ecosystems. The carrying capacity is affected by changes in the environment.

Extinction occurs when the last member of a species dies. When the population of a species begins declining rapidly, the species is said to be a threatened species. A species is endangered when its population is so low that it is nearly extinct.

Human actions have resulted in habitat loss and degradation that has

accelerated the rate of extinction.

The principal causes of deforestation are illegal logging, kaingin farming, forest fires, and conversion of agricultural lands to housing projects, and typhoon.

The effects of deforestation include soil erosion, floods, and depletion of wildlife resources.

The major cause of wildlife depletion is the loss of habitat.

Coral reef destruction is caused by dynamite fishing and muro-ami, while mangrove destruction is caused by overharvesting and conversion of the area into other uses.

In eutrophication, nutrients are washed away from the land to enrich bodies of water. It causes excessive growth of aquatic plants and algae and results in algal bloom, which eventually die and decompose. The process depletes the oxygen dissolved in water, causing fish and other aquatic organisms to die.

Acid rain is a result of air pollution mostly from factories and motor vehicles. Sustainable development means that a society should live under the carrying capacity of the environment.

Key Concepts:

Extinction occurs when the last member of that species dies.

When the population of a species begins declining rapidly, the species is said to be a threatened species.

A species is endangered when its population has become so low that it is possible of becoming extinct.

Human actions have resulted in habitat loss and degradation that have accelerated the rate of extinction.