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Students not only want to know how old a fossil is, but they want to know how that age was determined.Some very straightforward principles are used to determine the age of fossils.2) To familiarize students with the concept of half-life in radioactive decay.3) To have students see that individual runs of statistical processes are less predictable than the average of many runs (or that runs with relatively small numbers involved are less dependable than runs with many numbers).To determine the relative age of different rocks, geologists start with the assumption that unless something has happened, in a sequence of sedimentary rock layers, the newer rock layers will be on top of older ones. This rule is common sense, but it serves as a powerful reference point.Geologists draw on it and other basic principles ( to determine the relative ages of rocks or features such as faults.Here is an easy-to understand analogy for your students: relative age dating is like saying that your grandfather is older than you.Absolute age dating is like saying you are 15 years old and your grandfather is 77 years old.

Say for example that a volcanic dike, or a fault, cuts across several sedimentary layers, or maybe through another volcanic rock type.

Geology describes the structure of the Earth beneath its surface, and the processes that have shaped that structure.

It also provides tools to determine the relative and absolute ages of rocks found in a given location, and also to describe the histories of those rocks.

It wasn't until well into the 20th century that enough information had accumulated about the rate of radioactive decay that the age of rocks and fossils in number of years could be determined through radiometric age dating.

This activity on determining age of rocks and fossils is intended for 8th or 9th grade students.




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After paying a portion of such taxes for certain years, Goldsboro filed a refund suit in Federal District Court, and the IRS counterclaimed for unpaid taxes. (a) An examination of the IRC's framework and the background of congressional purposes reveals unmistakable evidence that, underlying all relevant parts of the IRC, is the intent that entitlement to tax exemption depends on meeting certain common law standards of charity -- namely, that an institution seeking tax-exempt status must serve a public purpose and not be contrary to established public policy. (b) The IRS's 1970 interpretation of § 501(c)(3) was correct. That court approved the IRS's amended construction of the Tax Code. All charitable trusts, educational or otherwise, are subject to the requirement that the purpose of the trust may not be illegal or contrary to public policy. It is both a religious and educational institution. These are but a few of numerous Executive Orders over the past three decades demonstrating the commitment of the Executive Branch to the fundamental policy of eliminating racial discrimination. In an area as complex as the tax system, the agency Congress vests with administrative responsibility must be able to exercise its authority to meet changing conditions and new problems. Since Congress cannot be expected to anticipate every conceivable problem that can arise or to carry out day-to-day oversight, it relies on the administrators and on the courts to implement the legislative will. This in turn may necessitate later determinations of whether given activities so violate public policy that the entities involved cannot be deemed to provide a public benefit worthy of "charitable" status. Bull., at 231, is wholly consistent with what Congress, the Executive, and the courts had repeatedly declared before 1970. That governmental interest substantially outweighs whatever burden denial of tax benefits places on petitioners' exercise of their religious beliefs. JUSTICE POWELL concedes that, if any national policy is sufficiently fundamental to constitute such an overriding limitation on the availability of tax-exempt status under § 501(c)(3), it is the policy against racial discrimination in education. Since that policy is sufficiently clear to warrant JUSTICE POWELL's concession and for him to support our finding of longstanding congressional acquiescence, it should be apparent that his concerns about the Court's opinion are unfounded. In light of our resolution of this litigation, we do not reach that issue.


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