Regrésate en el tiempo y sigue las huellas de dinosaurios en todo el mundo. Ya sean hechas por unos algunos dinosaurios o en grandes grupos, estas huellas ofrecen pistas sobre el movimiento y el comportamiento de estas adorables y criaturas del pasado. ¿Qué dinosaurios hicieron las huellas y qué piensan los científicos que los dinosaurios las estaban haciendo cuando las dejaron?
Zoos are amazing places to see and learn about the many native and exotic of animals that inhabit this world. Some animals are plentiful while others are threatened or in danger of extinction. Zookeepers not only feed and care for these animals, they may also be helping to conserve and protect whole species through breeding and "head start" programs. Follow the extraordinary duties of these unusual animal helpers in this behind-the-scenes photographic journal.
A simple exploration of tornadoes, examining how these spinning storms develop, how scientists watch for them and measure their strength, and the damage "twisters" can cause.
A simple exploration of hurricanes, examining how these massive sea storms develop, how scientists watch for them and measure their strength, and the damage hurricanes can cause.
A simple exploration of clouds, examining how these large masses of water vapor develop, the different forms they take at varying altitudes, and the problems clouds can cause.
A simple exploration of snow, examining how these icy flakes of precipitation develop, the ways in which snow can be used and enjoyed, and the problems snow can cause.
A simple exploration of thunderstorms, examining how these warm-weather storms develop, the relationship between lightning and thunder, and the damage thunderstorms can cause.
A look at camels, including their habitats, physical characteristics such as their humps, behaviors, relationships with humans, and protected status of wild species in the world today.
A look at cougars, including their habitats, physical characteristics such as their tawny coats, behaviors, relationships with humans, and protected status as a game animal in the world today.
A look at sea lions, including their habitats, physical characteristics such as their webbed flippers, behaviors, relationships with humans, and threatened status in the world today.
A look at tortoises, including their habitats, physical characteristics such as their domed shells, behaviors, relationships with humans, and protected status in the world today.
A look at rhinoceroses, including their habitats, physical characteristics such as their horned noses, behaviors, relationships with humans, and protected status in the world today.
A look at pandas, including their habitats, physical characteristics such as their black-and-white fur, behaviors, relationships with humans, and threatened status in the world today.
A look at whales, including their habitats, physical characteristics such as their streamlined bodies, behaviors, relationships with humans, and threatened status in the world today.
A look at jaguars, including their habitats, physical characteristics such as their powerful jaws, behaviors, relationships with humans, and threatened status in the world today.
A look at owls, including their habitats, physical characteristics such as their large and observant eyes, behaviors, relationships with humans, and protected status in the world today.
A look at woodpeckers, including their habitats, physical characteristics such as their hammering beaks, behaviors, relationships with humans, and protected status in the world today.
A look at zebras, including their habitats, physical characteristics such as their striped fur, behaviors, relationships with humans, and protected status in the world today.
In Justine McKeen, Walk the Talk, the second book in the Justine McKeen series, Justine decides there are too many cars idling in front of her school. So she comes up with a solution that should help keep the air cleaner. But she soon discovers not many adults trust her crazy ideas.
Maxine loves her giant tree in the Walbran Valley, but as she gazes at clearcuts from the car window, she worries. What if her tree is gone? Her family and friends trek through the old growth forest, and Maxine runs on ahead to check. Yes, her tree is there. She stands at its foot and listens, but it doesn't make its special sound, "Keer, keer." She will soon learn that "Keer, keer" is the sound a marbled murrelet (a mamu) makes. The mamu is an endangered seabird that flies far from the sea to nest in the high flat branches of the Sitka spruce. When a tree-climber confirms the presence of a mamu nest, Maxine's tree will be safe forever.
Old MacDonald had a...woods? Yes! Come along with Jo MacDonald and learn about the wild creatures in the woods at her grandfather's farm. Noisy ones, quiet ones, and a few surprises. This delightful variation on "Old MacDonald Had a Farm" playfully introduces youngsters to the woodland habitat while engaging little ones with rhythm and wordplay.
Rivers are teeming with life! Children will learn the geography of North American rivers and to appreciate the animals that live there while they count the baby otters or dragonflies. Their learning will be reinforced as they "squeal" like muskrats and "hop" like frogs. All of this fun learning activity is set to the rhythm of the classical tune of "Over in the Meadow."
This title examines an important historic event - the Three Mile Island nuclear disaster near Middletown, Pennsylvania. Easy-to-read, compelling text explores the history of nuclear power in the United States, how a nuclear plant works, details of the emergency at Metropolitan Edison Company's nuclear power plant, handling of the disaster by the Nuclear Regulatory Commission, President Jimmy Carter's visit to Three Mile Island, the investigation into the disaster, and the effects of this event on society. Features include a table of contents, glossary, selected bibliography, Web links, source notes, and an index, plus a timeline and essential facts.
As our world's population grows, so to does our need for energy. Scientists seek the next breakthrough in new technology while constantly finding ways to make current solutions cheaper and more efficient. In this title, discover what biomass energy is, its history, how we use it today, and how new technologies can contribute to our energy future. Learn about cutting-edge biofuels, including ethanol, biodiesel, and fuels from switchgrass and algae, and technologies that allow us to turn waste into energy. Sidebars, full-color photos, full-spread diagrams, well-placed graphs, charts, and maps, stories highlighting innovations in action, and a glossary enhance this engaging title.
As our world's population grows, so to does our need for energy. Scientists seek the next breakthrough in new technology while constantly finding ways to make current solutions cheaper and more efficient. In this title, discover what hydrogen and fuel cells are, their history, how we use them today, and how new technologies can contribute to our energy future. Learn how hydrogen extracted from ordinary water can be used to power homes and businesses or run fuel cells in vehicles. Sidebars, full-color photos, full-spread diagrams, well-placed graphs, charts, and maps, stories highlighting innovations in action, and a glossary enhance this engaging title.
