Regents and MidTerm Prep Answers - HMX Earth Science
Regents and MidTerm Prep Answers - HMX Earth Science
Regents and MidTerm Prep Answers - HMX Earth Science
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Name__________________________________! <strong>Regents</strong> <strong>and</strong> Mid Term <strong>Prep</strong>aration<br />
Radioactive Decay<br />
1. If the half life above is 5700 years, how many years have gone by? 11,400YRS<br />
2. In the example above, what percentage of original sample is left? ___25%_______<br />
3. What isotope is used to date young, organic material? __CARBON 14__________<br />
4. Name an isotope used to date a trilobite fossil? ___POTASSIUM 40_____________<br />
5. In the above example, if you start out with 1000 g of K40, how much Ar40 is left after<br />
2 half lives?______250G__________<br />
1 Half Life 2 Half Lives<br />
6. In the previous example, how many years have passed over 2 half lives? 2.6 BY<br />
PULL APART<br />
CONVERGENT<br />
CONT-CONT<br />
SAN ANDREAS<br />
FAULT<br />
JUAN DE FUCA/<br />
NA
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