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OleMash [197]
3 years ago
5

List the 2 major groups of biogenic sedimentary rocks based on their compositions.

Geography
1 answer:
Elodia [21]3 years ago
7 0

Explanation:

<u>Biogenic sedimentary rocks are formed by the remains of the animals and plants via the biological process . </u>

The two major groups are as follows -

Limestone - lt is made up of the exoskeletons of the mollusk , reef-forming corals, and foraminiferans .

Coal - it is made from the carbon in the dead and buried organic material and the wood of the dead plants which do not decay ( due to lack of oxygen ) but get petrified over the time .

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Assume that the Moon is hit by about 25 million micrometeorite impacts each day (this number comes from observations of meteors
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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 = 37.93\times 10^{16} cm^{2}

To find:  How long will it take to erase one footprint?

Using the above information,

No. of impacts per cm² per day is

= \frac{25000000}{37.93\times 10^{16}}

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

= \frac{25000000}{37.93\times 10^{16}}\times 300

= 6.59\times 10^{-9}

To erase the footprint there must be 20 impacts on the area of footprint.

Time taken for 6.59\times 10^{-9} impacts = 1 Day

Time taken for 1 impact is

= \frac{1}{6.59\times 10^{-9}} days

Hence, time taken for 20 impacts will be

= \frac{1\times20}{6.59\times 10^{-9}} days

= 3.03 \times 10^{9} days

= \frac{3.03 \times 10^{9}}{365}years

= 8.30 \times 10^{6} years

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.

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