A video and laboratory investigation are highlights to this lesson on acidification of ocean water due to increased atmospheric carbon dioxide. Using bromothymol blue (BTB) as an indicator, pupils analyze the amount of carbon dioxide...

Where does all of the carbon dioxide come from that is supposedly leading to climate change? Earth science pupils test animal, plant, and fossil fuels as sources in this investigation. Using an indicator, BTB, they are able to detect the...

To study circular flow, learners use the plans to trace through a series of interconnected economic and financial flows to explain the workings of the American economy. They use the model developed to comprehend the effects of Federal...

Arranged into small groups, learners read a paragraph of the news story "Texas Kid Writes Book About Presidents." As one reads, others mark the text (underlining important information and writing notes in the margin of the story). After...

Students evaluate historical sources. In groups, students explore the differences between a primary and secondary source. They examine the importance of evaluating sources and using credible ones when writing reports. Students...