This is possible because properties of rock formations are closely associated with the age of the artifacts found trapped within them.

The site also provides fact sheets on the age of the Earth and isochron dating.

Dating is a technique used in archeology to ascertain the age of artifacts, fossils and other items considered to be valuable by archeologists.

Upper most layers are considered the youngest while the lowermost deposition is considered as oldest.

• Relative dating does not tell the exact age, it can only compare items as younger and older.

C-14 has a half life of 5730 years which means that only half of the original amount is left in the fossil after 5730 years while half of the remaining amount is left after another 5730 years.

This gives away the true age of the fossil that contains C-14 that starts decaying after the death of the human being or animal. Absolute Dating • Dating techniques are used in archeology to ascertain the age of old artifacts and a broad classification of these methods bifurcates them in relative dating and absolute dating • Relative dating comes to a conclusion based upon the study of layer formation of rocks.

The word 'Pitch' refers to the height or depth of sound.

The term singing (or playing) 'off pitch' denotes that the note that is being sung is not 'in tune' with the recognised norm (the exact fixed note that a musical instrument is tuned to.(If you don't have a piano or guitar use the Computer Keyboard at the Electric Blues Club, although there is a much better Virtual Piano at Piano World - Links open in a new window - (don't use a wind or brass instrument you need to concentrate on singing not playing).

This 5-12-grade activity introduces students to the idea of sequencing information in overlapping data sets and the Principle of Superposition, which is a core concept in relative dating. Offers history of age dating, stratigraphic principles, rock correlation, fossil correlations, radiometric dating, and the geologic time scale. Short discussion of radioactive dating and stratigraphic principles.