Teaching: 'Factmonster.com' Earth's Geological Timeline
It is now generally assumed that planets are formed by the gathering and binding of gas and dust in a cosmic cloud, but there is no way of estimating how long this process takes. Our Earth acquired its present size, more or less, between 4,000 million and 5,000 million years ago. Life on Earth originated about 2,000 million years ago, but there are no good fossil remains from periods earlier than the Cambrian, which began about 550 million years ago. The largely unknown past before the Cambrian Period is referred to as the Pre-Cambrian and is subdivided into the Lower (or older) and Upper (or younger) Pre-Cambrian—also called the Archaeozoic and Proterozoic Eras. The known geological history of Earth since the beginning of the Cambrian Period is subdivided into three giant chunks of time, or eras, each of which includes a number of shorter periods. They, in turn, are subdivided into
even shorter subperiods. In a subperiod, a certain section may be especially well known because of abundant fossil finds. Such a section is called a formation, and it is usually identified by a place name.
[http://www.factmonster.com/]
Teaching: 'About.com'
Basic resources about geologic time and the ways we keep track of it.
[http://geology.about.com/]
Teaching: In Context
Scientists have divided the time that has passed since the beginning of earth's history into four time periods. These time periods are called eras. The first era is called the Azoic Era, the second era is the Palaeozoic Era, the third era is the Mesozoic Era, and the fourth era is the Caenozoic Era. It is important to understand the following eras in order to understand the progression of evolution.
[http://www.eng.iastate.edu/]
Teaching: United States Geographical Society
The Earth is a time machine that has been changing throughout its 4.5 billion-year history. Tree rings, past climates, rocks, and caves all tell the story of change.
[http://interactive2.usgs.gov/]
Teaching: Leeds University
Welcome to web-based teaching resources in structural geology in the School of Earth Sciences of the University of Leeds. In addition to resources created here you can also find links to other sites. Use the below icons to select topics.
[http://earth.leeds.ac.uk/]
Teaching: CTI Geography, Geology and Meteorology
The mission of the Centre — and the focus of this WWW server — is to enhance the quality and effectiveness of teaching and learning of geography in higher education through the use of appropriate learning technologies and associated resources.
[http://www.le.ac.uk/]
Teaching: Dynamic Earth
The Dynamic Earth appears at both Key Stage Three and Four. These topics can be difficult for the non-specialist to truely get to grips with. The Earth Science Education Unit provides targeted INSET for these topics.
[http://www.earthscienceeducation.com/]
