Answer:
The average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance
Explanation:
To determine the average atomic mass, we require abundance of every isotope in the nature.
Average atomic mass is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.
First, magma should go through an event called "crystallization". This will make sure that magma hardens up a little bit.
After this, exposure and weathering will do a thing. They will finish the process.
A reagent is a compound that is used for the detection of the absence or presence of another substance.
<h3>What are reagents?</h3>
Your information is incomplete as the available reagents aren't given. Therefore, an overview will be given.
Reagents are the integral part of a chemical reaction as they facilitate a reaction. A reagent is usually used tests.
Some typical examples of reagents include Tollens reagent, Fehling's reagent, Million's reagent, etc.
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Let me know if you need/want an explanation
The answer is (D) microscopic. You can remember this, because the name is very close to "microscope," an instrument used to greatly magnify and observe tiny organisms and objects.