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Locally, physical characteristics of rocks can be compared and correlated.On a larger scale, even between continents, fossil evidence can help in correlating rock layers.If the letters "T" and "C" represent fossils in the oldest rock layer, they are the oldest fossils, or the first fossils formed in the past for this sequence of rock layers. Now, look for a card that has either a "T" or "C" written on it.Since this card has a common letter with the first card, it must go on top of the "TC" card.Scientists also use direct evidence from observations of the rock layers themselves to help determine the relative age of rock layers.Specific rock formations are indicative of a particular type of environment existing when the rock was being formed.INTRODUCTION Scientists have good evidence that the earth is very old, approximately four and one-half billion years old.

Extinction of species is common; most of the species that have lived on the earth no longer exist.Time factors of millions and billions of years is difficult even for adults to comprehend.However, "relative" dating or time can be an easy concept for students to learn.Materials: two sets of sequence cards in random order (set A: nonsense syllables; set B: sketches of fossils), pencil, paper Procedure Set A: 1) Spread the cards with the nonsense syllables on the table and determine the correct sequence of the eight cards by comparing letters that are common to individual cards and, therefore, overlap.The first card in the sequence has "Card 1, Set A" in the lower left-hand corner and represents the bottom of the sequence.

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These major concepts are part of the Denver Earth Science Project's "Paleontology and Dinosaurs" module written for students in grades 7-10.

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    By measuring the ratio between the two isotopes you can calculate how long its been since the organism died. An isotope of an element has the same number of protons but different number of neutrons. Carbon-12 is the normal version of carbon, but Carbon-13 and Carbon-14, which are radioactive, also exist.

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