Ninth graders examine how scientist's contribute to atomic theory.  For this development of a scientific idea lesson students work in groups and research the development of the atomic model. 

In this science worksheet, students read an article that is scientifically based and decide how to respond to it. They respond to each of the statements listed using their article. Students also write a paragraph about one impact that...

Describes how the process of science works the same whether at the microscopic level or over a long period time. Clearly explains what a theory and a hypothesis are, and what an over-arching theory is.

This second lesson in a course on dinosaurs is devoted to extinction. There are group activities, discussion of the idea, and a way to assess what the students have learned.

"The survivals and extinctions at the close of the Cretaceous are such as might be expected to result from intensely hot winds such as would be generated by extra large meteoritic impacts." This article suggests that this theory should...