You need the Flash Player version 8.0.0.0 or higher and a JavaScript enabled browser to view this site

Natural Focus: The River Picks Up Speed

Related Article: Learn more about conservation.

Stream water mixes with oxygen in the atmosphere and, because of the cold water temperature, becomes highly oxygenated. The fast and shaded stream limits plankton growth.
Related Videos

Related Ad Categories

Upload Your Video/Register

browse videos in life science

Sort by:

Plants: Plants in the Tropical Rain Forest

Plants: Plants in the Tropical Rain Forest (3:11)

Over half of the plant species on earth are located in tropical rain forests, where conditions are ideal for photosynthesis and growth.

Introduction to DNA

Introduction to DNA (0:52)

This section discusses the discovery of DNA. DNA carries an organism's genetic material and may be passed on to its offspring.

Forests and Seeds: Caterpillars and Macaques

Forests and Seeds: Caterpillars and Macaques (5:10)

In temperate forests, caterpillars discard their skin, head and mouth; a pupa forms, and the caterpillar undergoes the transformation into a butterfly. The troop of Japanese macaques is revisited, and new behaviors are presented.

Understanding Biodiversity: Biodiversity is Important

Understanding Biodiversity: Biodiversity is Important (3:00)

This chapter discusses the importance of ecological preservation in order to maintain biodiversity.

Evolution: Genetics

Evolution: Genetics (2:29)

Genetic research explains how evolutionary changes actually occur. Biological evolution is the change in genetic composition of a species that happens over time.

recently added

Rotten But Not Forgotten: A Review of Decomposition

Rotten But Not Forgotten: A Review of Decomposition (0:36)

Learn more about the decomposition process in this video.

Rotten But Not Forgotten: Climate and Time

Rotten But Not Forgotten: Climate and Time (3:43)

Very dry conditions or cold temperatures can prevent decay. Forensic anthropologists use temperature, climate, humidity, season and clothing to determine time of death. Organic matter in different parts of the United States decay differently.

Rotten But Not Forgotten: Nature's Coal Composting

Rotten But Not Forgotten: Nature's Coal Composting (2:50)

Heat, pressure and time turned organic plant material into fossil fuels. Coal is carbon. The higher the grade of coal, the longer it has been buried. The grades of coal are peat, lignite, bituminous and anthracite.

Rotten But Not Forgotten: Organic Resource Management

Rotten But Not Forgotten: Organic Resource Management (2:46)

Composting facilities utilize the best conditions: moisture, size of decaying material and temperature for decomposition. The two methods of composting are aerobic and anaerobic. Landfills do not promote decomposition.

Rotten But Not Forgotten: Some Other Uses of Microbes

Rotten But Not Forgotten: Some Other Uses of Microbes (0:50)

Microbes may be used to consume pesticides, insecticides, herbicides, fungicides, plastics, hazardous waste and possibly other types of waste we produce.

Rotten But Not Forgotten: Bio Remediation

Rotten But Not Forgotten: Bio Remediation (1:29)

Bacteria have been designed to feed only on oil, which can be used to clean oil spills in a process called bio-remediation. Microbes can also be used in beach cleanup.

Rotten But Not Forgotten: From Baking to Athlete's Foot

Rotten But Not Forgotten: From Baking to Athlete's Foot (0:48)

Yeast is a fungus that feeds on sugars and starches, and releases carbon dioxide gas. Athlete’s foot infections are caused by fungal growth in sweaty socks.

Rotten But Not Forgotten: The Key Ingredients of Cheese

Rotten But Not Forgotten: The Key Ingredients of Cheese (0:45)

Bacteria and enzymes are added to milk, which produces lactic acid and sours the milk. Cheese is formed over time. Time, temperature, humidity and kind of milk determine the quality and kind of cheese.

Rotten But Not Forgotten: The Decomposition Process

Rotten But Not Forgotten: The Decomposition Process (1:42)

Decomposers break down the organic matter in decaying matter. Reduction or oxidation of carbon by decomposers is released back into the environment.

Rotten But Not Forgotten: The Decomposing Swamp

Rotten But Not Forgotten: The Decomposing Swamp (2:50)

The swamp environment is full of decomposition. As fallen trees rot, their nutrients return to the environment.