Multiple choice

What evidence did scientists use to determine that Earth's age is about 4.6 billion years?

  1. ocean salinity

  2. revolution around the Sun

  3. rock strata

  4. cloud formation
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C Correct answer
Explanation

Geologists and geophysicists analyze rock strata and use radiometric dating of both Earth rocks and meteorites to determine the age of the Earth. This geological evidence points to an age of approximately 4.6 billion years. Ocean salinity, cloud formation, and orbital revolution cannot be used to measure this timespan.

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