Atlas of the United States
Atlas of the United States

Author: Rand Mcnally

Publisher: Rand McNally

Published: 2016-10-26

Total Pages: 128

ISBN-13: 9780528016653

DOWNLOAD EBOOK

Atlas of the United States ] Grades 3-6 Atlas Features: [€[Extensive coverage of the United States and its regions through maps, photos, graphs, and text [€[Section on map & globe skills covers topics such as directions, scale, and how to read thematic maps [€[World map section features physical, political, and thematic maps [€[10 U.S. history maps [€[Eye-catching photos, engaging text, and fascinating "Time to Explore" features help to engage students [€[128 pages, paperback, 8.5" x 10 7/8"

Ground-water Mining in the United States
Ground-water Mining in the United States

Author: Gordon Sloggett

Publisher:

Published: 1986

Total Pages: 24

ISBN-13:

DOWNLOAD EBOOK

Abstract: Ground-water levels are declining from 6 inches to over 5 feet annually beneath 14 million acres of irrigated land in 11 States irrigated mainly by ground water. Pumping costs are rising, and well yields are declining, causing farmers to adjust their irrigation practices. Farmers are adopting new irrigation technologies to improve irrigation efficiency and are changing to crops with lower water requirements in some areas. However, techniques for conserving ground water may not extend the life of aquifers. State and local governments have passed laws severely restricting further irrigation development in about 45 percent of the irrigated area affected by ground-water mining.