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Use the links below to explore available resources covering major concepts associated with the study of the history of the Earth.Resources in this section pertain to the formation and evolution of the Earth and how it has been discovered through the relative and absolute dating of rocks and fossils.Topics include rock layer sequencing, fossil correlation, and radiometric dating.The Virtual Courseware Project produces interactive, online simulations for the life science laboratory or for earth science field studies.The carbon-14 decays with its half-life of 5,700 years, while the amount of carbon-12 remains constant in the sample.By looking at the ratio of carbon-12 to carbon-14 in the sample and comparing it to the ratio in a living organism, it is possible to determine the age of a formerly living thing fairly precisely. So, if you had a fossil that had 10 percent carbon-14 compared to a living sample, then that fossil would be: t = [ ln (0.10) / (-0.693) ] x 5,700 years t = [ (-2.303) / (-0.693) ] x 5,700 years t = [ 3.323 ] x 5,700 years Because the half-life of carbon-14 is 5,700 years, it is only reliable for dating objects up to about 60,000 years old.If you lost your glossary then you will need to print this one for use in the classroom.You must write the entire definition - do not skip words. As a result, you must think about the definition that is appropriate based on the unit that you are studying.

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The newly studied fossils come from a species that has been dubbed Homo naledi. Estimates had put them at between 900,000 and 1.8 million years old.Geoscientist Paul Dirks of James Cook University in Townsville, Australia, directed the team's dating effort.Their group shared its findings in a trio of papers published May 9 in e Life. naledi is, it does not solve two important puzzles: When did this species first emerge and when did it die out?The study of fossils and the exploration of what they tell scientists about past climates and environments on Earth can be an interesting study for students of all ages.Teaching about Earth's history is a challenge for all teachers.Editable online templates for constructing a lab report and a grading rubric are available for the teacher, as well as access to their class or individual student assessment profiles. Technical Requirements The activities require Macromedia Flash Player 8 and many functions require that pop-up blockers be disabled.