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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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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Which of the following correctly lists spectral types in order of decreasing temperature (from hottest to coolest)?

A) MKGFABO B) OBAGFKM C) OBAFGKM D) ABFGKMO E) BAGFKMO

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Which plate boundary has the lowest earthquake frequency?

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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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