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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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?

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