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The Earth is 4.6 billion years old, but human civilization (the building of cities) began only about 10,000 years ago. If you represent the history of Earth with a line one mile long (63,360 inches), how long must the line be to represent the history of human civilization?

Respuesta :

Answer:

0.13774 inches ( approx ).

Step-by-step explanation:

Given,

The age of earth = 4.6 billion years = 4600000000 years,

The represented age of earth = 63,360 inches,

That is, scale factor in representation of age

[tex]=\frac{\text{Represented age}}{\text{Actual age}}[/tex]

[tex]=\frac{ 63,360}{4600000000}[/tex]

Now, the age of human civilization = 10000 years,

Thus, the represented age of human civilization = actual age × scale factor

[tex]=10000\times \frac{ 63,360}{4600000000}[/tex]

[tex]=\frac{633600000}{4600000000}[/tex]

[tex]=0.137739130435[/tex]

[tex]\approx 0.13774\text{ inches}[/tex]

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