contestada

earth is about 4.5 billion years old, extends back to 10,000 years. it is repesented with a 10 meter timeline, what distance represents 4 billion years?

Respuesta :

1 billion = 1,000,000,000 years = 10^9 years


10,000 years = 10^4 years


10^4 years are represented with a 100-meter-long timeline


10^9 years are represented with a x-meter-long timeline


10^4/100 = 10^9/x


x = 10^7 m


1 billion = 10^9 years are represented with a 10^7-meter-long timeline


4.5 billion = 4.5*10^9 years are represented with a 4.5*10^7-meter-long timeline


(4.5*10^7 - 100) meters from the start is where the written human history begins   

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