Science

Students will explore saltwater environments -- from shorelines to coral reefs -- and learn about the fish, plants, mammals and insects that depend on each other for survival in this aquatic biome. Examine concepts such as salinity and currents, and find out about the three major life zones found in ocean waters.

"Biomes of the World in Action" is a fun, informative series that takes students on a fast-paced eco-adventure around the world exploring the many characteristics that make these large regions of the world different from one another.

"Biomes of the World in Action" is a fun, informative series that takes students on a fast-paced eco-adventure around the world exploring the many characteristics that make these large regions of the world different from one another.

"Biomes of the World in Action" is a fun, informative series that takes students on a fast-paced eco-adventure around the world exploring the many characteristics that make these large regions of the world different from one another.

Oceans provide habitats for millions of marine species and cover more than 70 percent of the Earth's surface. Segments detail seafloor maps, the role of water in our planet's life cycles, three states of matter, and the crucial balance among all life-forms.

Segment 1: Geologic Time (6 min.) Learn how absolute and relative times help scientists examine the Earth's age, as well as prehistoric life forms. Segment 2: Prehistoric Life (4 min.) Discover how fossils are formed and see the clues they give scientists to learn details about prehistoric life and the history of our planet.

Segment 1: (6 min.) Life Cycles - All organisms undergo cycles of life. Learn about the life cycles of several animals, including reproduction. Segment 2: (5 min.) Heredity - Learn about genes and heredity and discover the genetic connection between modern birds and ancient dinosaurs.

Take a trip to a recycling center, a landfill, and a town dump to understand what happens to trash after it is thrown away. Focus on the environmental problems created by solid waste and discover ways to alleviate the problem. Learn that through daily conservation methods, people can control the amount of waste they produce.

Little on this earth can withstand the violent fury of an F5 tornado. A churning vortex with winds over 300 miles an hour, these tornadoes create immense swaths of death and destruction in a matter of seconds. But today, experts are exploring the supertwister's complex inner working in bold new ways in the hopes of one day being able to accurately predict the occurrences of tornadoes.

In 2009, filmmaker Josh Fox learned his home in the Delaware River Basin was on top of the Marcellus Shale, a rock formation containing natural gas that stretches across New York, Pennsylvania and huge stretches of the Northeast.

Is access to clean drinking water a basic human right, or a commodity that should be bought and sold like any other article of commerce? Stephanie Soechtig's debut feature is an unflinching examination of the big business of bottled water.

A huge bottled-water industry has recently emerged, with the U.S. its largest consumer. But is bottled water actually healthier, safer, or tastier than tap water? A water expert explains that bottled water does not meet the same strict standards in the U.S. as water from the tap, though tap-water quality can vary among communities.

Despite its wonders, Earth's water cycle does not spread water evenly around the planet. The Ogallala Aquifer’s huge underground reservoir of water gives the relatively dry Central Plains states such as Nebraska a large but limited irrigation source. But the aquifer's water is being used up faster than it is beng replenished.

The Rio Grande is one of our longest rivers, its Texas section forming the border between the U.S and Mexico. Competing human claims for it are viewed through the eyes of two young women: a whitewater rafting guide in upstream New Mexico and a teenager downstream near El Paso.

Drinking polluted water can cause many deadly diseases, especially in children of poor countries around the world. We see the crystal-clear water in a flowing Peruvian rainforest river but are amazed to learn that it is unsafe, due to runoff entering the great connected network of tributaries that flow into the Amazon, the world’s largest source of fresh water.