m. associated with hot, ion-rich water

n. began about 4.6 billion years ago

o. this rock type forms from heat and pressure, but not melting

p. principle indicating that older layers of rock are located at the bottom, while younger layers are closer to the surface

What is the age of a rock containing 25% Uranium-235 and 75% Lead-207?

The age of the rock would be about 1.4 billion years old.

Did this rock form before, during, or after the Carboniferous Period?

The rock with Uranium-235 and Lead-207 is 1.4 billion years old, predating the Carboniferous Period, showcasing the significance of radioactive dating in geology.

Explanation:

The age of a rock containing 25% Uranium-235 and 75% Lead-207 would be approximately 1.4 billion years old. This estimation is based on the principle of radioactive decay, specifically the decay of Uranium-235 into Lead-207, which allows for the calculation of the rock's age.

This rock would have formed before the Carboniferous Period. The Carboniferous Period occurred approximately 358.9 million to 298.9 million years ago, making the rock much older in comparison.

Radioactive dating, supported by the physics of isotope stability, is instrumental in determining the ages of rocks and providing insights into Earth's geological history.

Learn more about Geological dating using radioactive decay here:

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