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The seafloor has a diverse landscape, which includes underwater lakes and rivers. How is that possible? Well, these lakes and rivers form when seawater seeps up through thick layers of salt, which are present beneath the seafloor. As the water seeps up, it dissolves the salt layer, causing it to collapse and form depressions. The dissolved salt makes the water denser, and because it is denser than the water around it, it will settle into the depressions, forming a river or lake. Part of the "Deep Sea Dive" series.
(Source: DCMP)
Part of the "Life in Aquatic Environments" series. Places many of the organisms into an ecological perspective of hydras, planarians, annelids, aquatic insects, rotifers, protists, and all other organisms that provide food for fish and other vertebrates. Observes adaptations for planktonic life in daphnia and other cladocerans, copepods, rotifers, and planktonic algae. Explores bacterial decomposition, recycling of materials, adaptations for bottom life, and ecological relationships in the bottom community. Takes an underwater look at the highly specialized organisms that live in rapids, under rock communities, and in slower waters. Investigates adaptations for life in temporary wetland environments.
The Large Lakes Observatory (LLO) helps an interdisciplinary group of scientists use oceanographic research approaches to investigate the mysteries of large lakes. With support from the National Science Foundation, LLO scientists work to better understand the biology, chemistry, physics, and geology of these bodies of water. In the summer of 2011, LLO scientists completed a 17- day research cruise on Lakes Superior, Huron, and Erie, focusing on how a buildup of nitrates may impact the ecology of all the Great Lakes. They say a greater understanding of lakes will ultimately improve our management and conservation efforts.
While asleep, a young girl dreams that her computer teaches her about earth's geographic areas. Uses a globe to tell about areas of water (oceans, lakes, and rivers), land (mountains, forests, canyons, deserts, plains, and poles), and climates (cold, tropic, and moderate). Emphasizes that all areas and features of earth support life.
Investigates both saltwater and freshwater biomes. Explores how ocean temperature, salinity, and depth affect the enormous diversity of marine life. Covers the intertidal, neritic, and open ocean zones and their characteristics. Also examines estuaries and freshwater biomes such as streams, lakes, and ponds. Defines terms and concepts, and reviews content before a quiz.
Narration, song, and underwater photography capture the primary characteristics of fish: scales, gills, and fins. Shows how fish swim and how they protect themselves. Labels identify key words.
Kayaker John Bowermaster has traveled to one of the driest places on earth to go kayaking. The altiplano region in the highlands of South America is a dry region with extreme temperatures, but nestled between the volcanoes are shallow mineral lakes. Segment of video from Wild Chronicles Series.
Focuses on animal life in four extremely inhospitable deserts: the Namib's adaptive elephant, a dromedary roundup in Australia's outback, fish in thermal lakes in Mexico's Chihuahua desert, and the Sahara's Ennedi crocodiles. Survival is an eternal challenge to any life in these places.
Chris Pulliam is a product manager at Great Lakes NeuroTechnologies. He specializes in designing equipment that monitors different signals the body generates. Biomedical engineers work at the intersection of medicine and engineering. Part of the "Career Connections" series.
Saturn's giant, hazy moon Titan has been essential to NASA's Cassini mission during its 13 years of exploration. NASA used the Huygens probe to explore the surface of Titan, and the scientists were surprised at the geology of the moon. Titan has turned out to be a very complex world with methane rain, lakes, and dunes.
Part of the animated "Johan, the Young Scientist" series. Housebound during a rainy day, Johan goes to ScienScape where it also rains. Johan, Ani, and Moki set out to find where the rainwater ends up. This leads them from gutters to drains to rivers. They soon learn that all living beings need water to survive.
What is the fire history of New Zealand's unique landscape? Scientists from around the globe converge on New Zealand's many lakes extracting sediment cores that tell the story of the country before and after the arrival of the Maori and European settlers. Part of WildFIRE PIRE series.
Part of a series that features a wide variety of video footage, photographs, diagrams, graphics, and labels. For this particular video, students will focus on the parts of the Earth where water is found in its frozen, solid form, also known as the cryosphere. The cryosphere includes frozen lakes, glaciers, sea ice, icebergs, and snow. Part of the Science Video Vocab series.
Maritime archaeology is a discipline within archaeology that specifically studies human interaction with oceans, lakes, and rivers through the study of artifacts. Researchers trace the historical aspects of human dependence and influences on bodies of water. Some areas of interest include harvested goods from the sea, fishing techniques, transportation, and water quality. Part of the "Adventures of a Maritime Archaeologist" series.
In the last few years, the Red Planet has yielded up many new clues that life may have once existed there...and may even exist there today. There is now proof that water once flowed on the surface, that Mars once had lakes, and that the frozen poles are mostly water. Mars has snow--an aurora--and lightning generated by dust storms. Most intriguing of all are the seasonal plumes of methane that just may point to bacteria living below the surface.
Leaf cutter ants could be called the overachievers of the insect world. They are farmers, medicine makers, and green energy producers. With support from the National Science Foundation, bacteriologist Cameron Currie studies the complex evolutionary relationships between the ants, the fungi they cultivate and eat, and the bacteria that influence this symbiosis. At the University of Wisconsin-Madison, Currie works with the Great Lakes Bioenergy Research Center on campus to explore how the ants manage to degrade cellulose. Her goal is to discover new ways humans might break down biomass into biofuels. The bacteria component of the ant colony could also help scientists develop more effective antibiotics for human health and agriculture.
After the end of the last ice age 10,000 years ago, populations of marine stickleback fish became stranded in freshwater lakes dotted throughout the Northern Hemisphere in places of natural beauty like Alaska and British Columbia. These little fish have adapted and thrive, living permanently in a freshwater environment drastically different than the ocean. Stickleback bodies have undergone a dramatic transformation, some populations completely losing long projecting body spines that defend them from large predators. Various scientists, including David Kingsley and Michael Bell, have studied living populations of threespine sticklebacks, identified key genes and genetic switches in the evolution of body transformation, and even documented the evolutionary change over thousands of years by studying a remarkable fossil record from the site of an ancient lake ten million years ago.
Moko is an explorer. As he travels the world continent by continent, he makes many friends and discovers many natural phenomena which sometimes delight him, and other times scare him. Each animated episode recounts an adventure and takes an "original story" approach to explaining these natural phenomena. In this episode, one morning, Totemie takes Moko to pick wild mushrooms used for medicine by her people. There is a particularly rare one she is hoping to find. Moko suddenly slips in a crevice. Totemie runs to her village to get an old man who tells her that she should join Moko. When she does, Moko and Totemie discover an enormous cave filled with lakes in a rainbow of colors. They follow a stream that eventually becomes a river and on the river's bank they find the old man who is waiting for them. Before they leave to go back to the village, the old man asks them to keep this magical cave a secret and to keep the memory of it safe in their mind.
Moko is an explorer. As he travels the world continent by continent, he makes many friends and discovers many natural phenomena which sometimes delight him, and other times scare him. Each animated episode recounts an adventure and takes an "original story" approach to explaining these natural phenomena. In this episode, Moko wants to know what lies beyond the forest and decides to go find out. Totemie comes along and after a long walk they find a mountain village. Moko, who hasn't seen the ocean in a long time, is dreaming of seeing it again, but realizes that it will be awhile before they cross this mountain and see the sea. But then, they see boats and barges. Why would there be boats on a mountain? An old man comes to them and tells them that if it is the ocean one seeks, sometimes it can be found even on a mountain. Curious, Moko and Totemie walk on into the forest and discover what can only be an ocean atop the mountain, only here they don't say ocean or sea, but rather they call it a lake. Moko believes that this lake is here in order to console the people who cannot live beside the ocean.
