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Author: National Research Council
Publisher: National Academies Press
ISBN: 0309042690
Category : Technology & Engineering
Languages : en
Pages : 186
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Book Description
For developing nations, soil erosion is among the most chronic environmental and economic burdens. Vast amounts of topsoil are washed or blown away from arable land only to accumulate in rivers, reservoirs, harbors, and estuaries, thereby creating a double disaster: a vital resource disappears from where it is desperately needed and is deposited where it is equally unwanted. Despite much rhetoric and effort, little has been done to overcome this problem. Vetiver, a little-known tropical grass, offers one practical and inexpensive way to control erosion on a huge scale in both humid and semi-arid regions. Hedges of this deeply rooted species catch and hold back sediments while the stiff foliage acts as a filter that also slows runoff and keeps moisture on site. This book assesses vetiver's promise and limitations and identifies places where this grass can be deployed without undue environmental risk.
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309042690
Category : Technology & Engineering
Languages : en
Pages : 186
Get Book Here
Book Description
For developing nations, soil erosion is among the most chronic environmental and economic burdens. Vast amounts of topsoil are washed or blown away from arable land only to accumulate in rivers, reservoirs, harbors, and estuaries, thereby creating a double disaster: a vital resource disappears from where it is desperately needed and is deposited where it is equally unwanted. Despite much rhetoric and effort, little has been done to overcome this problem. Vetiver, a little-known tropical grass, offers one practical and inexpensive way to control erosion on a huge scale in both humid and semi-arid regions. Hedges of this deeply rooted species catch and hold back sediments while the stiff foliage acts as a filter that also slows runoff and keeps moisture on site. This book assesses vetiver's promise and limitations and identifies places where this grass can be deployed without undue environmental risk.
Author: Sarah Kellett
Publisher: CSIRO PUBLISHING
ISBN: 1486306152
Category : Mathematics
Languages : en
Pages : 129
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Book Description
Did you ever wonder why some insects can walk on water? Or how the ancient Egyptians made mummies? Are you curious about why a guitar sounds different from a flute? Gather some everyday materials from around your home and find out the answers with these 50 kid-approved science activities from CSIRO. The activities cover electricity and magnetism, sound and light, heat and motion, water and gases, living things, shapes and our planet Earth. Each activity has a simple list of materials required, and uses simple step-by-step instructions and drawings to enable you to create exciting and interesting reactions, experiments and inventions. Fast facts and quiz questions will help you test your knowledge, and you’ll also find an explanation of the science behind each activity, along with examples of how each principle works in the real world. Discover more about the world of science by making: dancing slime, rubbery bones, a ping pong ball shooter, ghastly ghostly photos, fizzy dinosaur eggs and a lemon battery.
Author: Terry Tempest Williams
Publisher: Macmillan + ORM
ISBN: 0374712298
Category : Nature
Languages : en
Pages : 330
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Book Description
Timely and unsettling essays from an important and beloved writer and conservationist In Erosion, Terry Tempest Williams's fierce, spirited, and magnificent essays are a howl in the desert. She sizes up the continuing assaults on America's public lands and the erosion of our commitment to the open space of democracy. She asks: "How do we find the strength to not look away from all that is breaking our hearts?" We know the elements of erosion: wind, water, and time. They have shaped the spectacular physical landscape of our nation. Here, Williams bravely and brilliantly explores the many forms of erosion we face: of democracy, science, compassion, and trust. She examines the dire cultural and environmental implications of the gutting of Bear Ears National Monument—sacred lands to Native Peoples of the American Southwest; of the undermining of the Endangered Species Act; of the relentless press by the fossil fuel industry that has led to a panorama in which "oil rigs light up the horizon." And she testifies that the climate crisis is not an abstraction, offering as evidence the drought outside her door and, at times, within herself. These essays are Williams's call to action, blazing a way forward through difficult and dispiriting times. We will find new territory—emotional, geographical, communal. The erosion of desert lands exposes the truth of change. What has been weathered, worn, and whittled away is as powerful as what remains. Our undoing is also our becoming. Erosion is a book for this moment, political and spiritual at once, written by one of our greatest naturalists, essayists, and defenders of the environment. She reminds us that beauty is its own form of resistance, and that water can crack stone.
Author:
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Category : Civil engineering
Languages : en
Pages : 516
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Book Description
Author: United States. Congress. House
Publisher:
ISBN:
Category :
Languages : en
Pages : 2404
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Book Description
Author:
Publisher:
ISBN:
Category : Erosion
Languages : en
Pages : 924
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Book Description
Author: United States. Congress. House. Committee on Appropriations
Publisher:
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Category :
Languages : en
Pages : 1940
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Book Description
Author: United States. Congress. House. Committee on Appropriations
Publisher:
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Category :
Languages : en
Pages : 854
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Book Description
Author: New Zealand. Parliament
Publisher:
ISBN:
Category : New Zealand
Languages : en
Pages : 812
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Book Description
Author: United States. Congress. House. Committee on Public Works and Transportation. Subcommittee on Water Resources
Publisher:
ISBN:
Category : Dredging
Languages : en
Pages : 312
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Book Description
