About how long would it take for one of the footprints left by the apollo astronauts to be erased? (hints: use the moon's surface area to determine the impact rate per square centimeter, and suppose that a footprint has an area of 300

8.30 Million years                

Explanation:

Assuming that --

In one day, the moon's surface is hit by the number of micrometeorites

= 25 million                                                                                                                                                            = 25000000

To erase a footprint, the number of impacts needed are  = 20

It is given that area of footprint = 300 cm²

We know that surface area of the Moon is = 37.93 Million Km²

                                                                      =

Therefore, using above information, we get

No. of impacts on the moon per day per cm² is =

∴ No. of impacts on area of a foot print (300 cm²) per day will be,

=

=

Now as assumed there must be 20 impacts on the footprint's area to erase the footprint

Time taken for impacts = 1 Day

∴ Time taken for 1 impact is given by

= days

Therefore, the time taken for 20 impacts will be

= days

=

=

= years

Hence, it would take 8.30 million years for the footprint to be erased.

gans

explanation:

vestigial organs (like your appendix) are organs that no longer serve a purpose.