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m_a_m_a [10]
3 years ago
10

Which statement describes the Mercalli scale? This scale measures seismic waves based on their size. This scale rates an earthqu

ake according to how much damage it causes. This scale produces a single rating for earthquakes that reach the surface. This scale measures the magnitude of an earthquake based on the size of seismic waves.
Geography
2 answers:
tester [92]3 years ago
9 0

Answer:

The correct option is:

This scale rates an earthquake according to how much damage it causes.

Explanation:

The Mercalli Scale was invented by Giuseppe Mercalli in 1902. It is not considered that much of a scientific method to measure to measure strength of an earthquake.

Mercalli scale uses the observation of people who experienced the earthquake, to estimate the intensity. Its measurement is based on how much effect or damage it causes to the humans, objects, buildings, and other man made things.

It is not considered a good way to measure intensity of earthquakes because some witnesses may exaggerate the effects while some may consider it nominal.

Colt1911 [192]3 years ago
8 0

Answer                                              it is b

Explanation:

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3 years ago
Assume that the Moon is hit by about 25 million micrometeorite impacts each day (this number comes from observations of meteors
mestny [16]

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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ANTONII [103]

Answer:

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Explanation:

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Answer: I think it is command

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