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Scientific measurements such as radiometric dating use the natural radioactivity of certain elements found in rocks to help determine their age.

Scientists also use direct evidence from observations of the rock layers themselves to help determine the relative age of rock layers.

On a larger scale, even between continents, fossil evidence can help in correlating rock layers.

The Law of Superposition, which states that in an undisturbed horizontal sequence of rocks, the oldest rock layers will be on the bottom, with successively younger rocks on top of these, helps geologists correlate rock layers around the world.

Download: Description: Unit questions from five consecutive New York regents exams.

PALEONTOLOGY, AND in particular the study of dinosaurs, is an exciting topic to people of all ages.

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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*Earth and Space Science: Fossils provide important evidence of how life and environmental conditions have changed.

Since this card has a common letter with the first card, it must go on top of the "TC" card.

The fossils represented by the letters on this card are "younger" than the "T" or "C" fossils on the "TC" card which represents fossils in the oldest rock layer.

Specific rock formations are indicative of a particular type of environment existing when the rock was being formed.

For example, most limestones represent marine environments, whereas, sandstones with ripple marks might indicate a shoreline habitat or a riverbed.

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