Answer:
A is the eyepiece (or ocular lens), B is the objective lenses, C is the iris diaphragm, D part is refers to light condenser, E is the location of fine adjustment knob and F is the location of coarse adjustment knob.
Explanation:
A is the eyepiece (or ocular lens), B is the objective lenses, C is the iris diaphragm, D part is refers to light condenser, E is the location of fine adjustment knob and F is the location of coarse adjustment knob. All these parts are the important parts of microscope which has a specific function in the microscope. Without one of these parts, we can not see the microbes in the microscope.
During volcanic eruptions, some of those that is emitted by the volcano are water vapors. With the proper conditions, these water vapors then condense. The precipitation of water vapors from volcanic eruption about 3-4 billion years ago became the origin of the seas.
A chord made of tons only a half step or a whole step apart is known as a tone cluster .
Hence OPTION(D) is correct.
tone cluster :
A tone cluster is a musical chord comprising at least three adjacent tones in a scale . prototypically tone cluster are based on the chromatic scale and are separated by semitones . it is used in twentieth century music .
Polytonality :
The technique of using two or more tonal centres at the same time is called polytonality .
A polychord :
The combination of two traditional chords sounding together is known as a polychord . it consists of two or more chords ,one on the top of the other.
Bitonality :
use of two musical keys at the same time is called as bitonality.
Hence OPTION (D) IS correct.
Learn more about musical tones here:
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Weathering, acid rain can mostly destroy like stone, I suggest you look up pictures of acid rain and how it affects (limestone)