Which statement describes the Mercalli scale? This scale measures seismic waves based on their size. This scale rates an earthqu
2 answers:
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Answer:
3.03 Billion Days or 8.30 Million years
Explanation:
Given,
No. of micrometeorite impacts per day on the Lunar surface = 25000000
Impacts needed to erase a footprint = 20
Area of footprint = 300 cm²
We know that surface area of the Moon = 37.93 Million Km² =
To find: How long will it take to erase one footprint?
Using the above information,
No. of impacts per cm² per day is
No. of impacts on area of a foot print (300 cm²) per day will be,
To erase the footprint there must be 20 impacts on the area of footprint.
Time taken for impacts = 1 Day
Time taken for 1 impact is
Hence, time taken for 20 impacts will be
It would take around 3.03 Billion Days or 8.30 Million years for one of the footprints left by the Apollo astronauts to be erased.