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Q: What are sub surface structural units in geology?
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Where multiples and sub multiples of units are used?

Multiple and sub-multiples are used when the range of values is too large to be measured in a single unit.


Where multiples and sub-multiple of units are used?

these are used to express very large number small and very small


What unit of measurement is used most by scientist?

The standard for science the world over is the metric system, and most commonly the mks system of units. This stands for meter, kilogram, seconds. Different sub-fields may use slightly tweeked units like the cgs system which stands for centimeter, gram, seconds but these are still metric units.


How many standard units are there?

Without knowing the specific subject or sub-category of that subject it is not possible to give a numeric answer.There are several systems of measurement each with different standard units. The most commonly used is the SI system, however, all rely on defined units and others that are derivedfrom these.Defined units would be for such things as mass, length and time.Derived units would be area, volume and speed.These are only examples.There are also units with no physical quantity which are used in certain areas which are purely comparative.An example would be a persons IQ for instance


What is the difference between stratified an random sampling?

In (Simple) random sampling, all of the units in the sample have the same chance of being included in the sample. Units are selected randomly from a population by some random method that gives equal probability to each element. In stratified random sampling, the entire population is divided into heterogeneous sub-popuation known as strata (sub-population with unequal variances) and a random sample is chosen from each of these stratum. The reason when to use which depends on the situation and need of the experimenter.

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