Question

8. You find a 10,000,000 year old rock 2,500 km away from the nearest seafloor spreading center, how fast has the plate been moving since its formation? Give answer in cm/yr. (Hint: 1 km = 100,000 cm)

Answer 1

You find a 10,000,000 year old rock 2,500 km away from the nearest seafloor spreading center. The plate has been moving since its formation by (2,500 km)(100,000 cm/1 km)/(10,000,000 yr).so the plat has been moving equal to 25 cm per year since its formation.

Answer 2

Answer:

$7.93x10^{-7}cm/s$

Explanation:

Hello,

In this case, the motion velocity is determined by the equation:

$v=\frac{distance}{time}$

In such a way, we first develop the units conversions for the required units:

$time=10000000year*\frac{365day}{1year} *\frac{24h}{1day} *\frac{3600s}{1h}=3.1536x10^{14}s$

$distance=2500km*\frac{100000cm}{1km}=2.5x10^6cm$

Now, the velocity is computed as shown below:

$v=\frac{2.5x10^6cm}{3.1536x10^{14}s} =7.93x10^{-7}cm/s$

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