# Which allowed scientists to determine that Earth was at least 4.3 billion years old? A.magnetic field surrounding zircon B.the radioactive decay of uranium to lead C.the electrical conductivity of uranium ions D.chemical reactivity of zircon ions

###### Question:

Which allowed scientists to determine that Earth was at least 4.3 billion years old?
A.magnetic field surrounding zircon
C.the electrical conductivity of uranium ions
D.chemical reactivity of zircon ions

### 1. Which maps give you a more detailed picture of the terrain? A) Relief maps B) Road maps C) Physical maps D) Political maps 2. Which maps show you how to get from place to place? A) Road maps B) Physical maps C) Weather maps D) Political maps

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### Can anyone help ? :(

can anyone help ? :(...

### I need help! Thank youuu

I need help! Thank youuu...

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