The theory is constructed from existing evidence and data and is not amenable to empirical testing.
Computer modelling is as close as one can come to reconstruction of the Earth's past.
The theory is a powerful tool to enlighten us about the geological history of Saskatchewan. This unit has strong ties to the grade 8 core unit Energy Resources in Saskatchewan and to the grade 7 optional unit Resource Use . Since the deposits of coal, natural gas, and petroleum are the results of geologic processes, and resource use policy deals with these fossil fuels and other mineral resources, these three units could be integrated. Science writing and reading activities, as discussed in this Guide, should be incorporated into each lesson. Writing in personal, reflective journals, reading from newspapers and magazines, and reporting on the activities of science class in the form of stories, letters to peers, and newspaper articles are ways by which students may refine their understanding of the concepts of science and develop their ability to communicate through the written word.