Description:
To develop an understanding of parts per million as a concept, teams of students create successive dilutions of a solution to reach a parts-per-million concentration. Background information for teachers relates the activity to four themes: time, change, cycles, and the Earth as home. A teacher reading list is provided. Part of a packet of lesson plans on global change.

Organization:
U.S. Geological Survey (USGS)

URL:
http://interactive2.usgs.gov/learningweb/teachers/globalchange_change.htm

Contact:
Learning Web Team
E-mail: learning_web@usgs.gov

Earth Science Questions
Email: ask@usgs.gov

http://www.usgs.gov/

Cost:
Free over the Internet

Education Level:
Grades 5-8

Subject:
Chemistry
Global Environmental Change

Resource Type:
Internet Site
Curriculum/Instructional Materials

Date Added to teachearth.com:
5/1/00