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Petroleum is a fossil fuel containing many different carbon compounds. If the carbon atoms in petroleum have been in the ground for 100 million years, what fraction of the initial 14C atoms is still there? (t1/2 = 5,370 yr)
IQ Score
A measure of a person's intellectual abilities compared to the average population, typically scored on a scale where 100 is the average.
First-Grader
Refers typically to a student in the first grade of school, being their second year of formal education, usually six or seven years old in many countries.
Teacher's Attitude
The predispositions or orientations a teacher holds towards students, teaching practices, and educational expectations.
Spearman Rank-Correlation
A non-parametric measure of rank correlation, assessing how well the relationship between two variables can be described using a monotonic function.
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