To date the age of Earth, we look for rocks with a high percentage of
A) uranium-235 to lead-207.
B) uranium-238 to lead-206.
C) potassium-40 to argon-40.
Answer: B
Physics & Space Science
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Which of the following correctly lists spectral types in order of decreasing temperature (from hottest to coolest)?
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Which plate boundary has the lowest earthquake frequency?
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Terrestrial worlds are all differentiated, which means they are separated into layers of different _______________
Fill in the blank(s) with correct word
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A steam engine is operating at its theoretical maximum efficiency of 60%. If the waste heat has a temperature of 100°F (38°C), what is the temperature of the boiler?
a. 350°C b. 94°C c. 225°C d. 504°C e. 775°C
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