01172cam a2200277 7i4500 0000056772 20080608090000.0 080316s2006 -usa 0 eng 1417107413 QD 142 .W3 2006 Water analysis produced and directed by ScienCentral, Inc.; executive producers, Andrew Schlessinger and Tracy Mitchell.. Fullscreen ed.. [United States]: Schlessinger Media, 2006. 1 videodisc (23 min.): sd., col.; 4 3/4 in.. Science lab investigations! DVD series Title from container Viewers follow a group of high school students as they test and compare different water sources for eight factors: temperature, pH, dissolved oxygen, hardness, alkalinity, nitrates, coliform bacteria, and chlorine Grades 9-12 DVD Water -- Analysis Water -- Experiments Schlessinger, Andrew Mitchell, Tracy ScienCentral, Inc. Schlessinger Media 1100053004 CD-ROM Bahan Sumber Media BILIK BAHAN SUMBER MEDIA