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The decreasing of the illuminated face of the Moon (full to new) is called "waning." (The opposite, increased illuminated area, is called waxing.)

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When the size of visible portion of the moon is decreasing the moon?

When the illuminated portion is decreasing from one night to the next, the moon is in its 'waning' phases.


What is the visible lighted face of the sun?

Photosphere


When more than a quarter of the moon is visible and the visible portion is becoming smaller as the moon moves toward the third quarter what is the moon phase?

The moon phase you are describing is the waning gibbous phase. This occurs after the full moon and before the third quarter moon when the illuminated portion of the moon is decreasing.


When the amount of the lighted surface of the moon that is visible from earth is decreasing?

This phase is called a waning moon and occurs as the moon transitions from a full moon to a new moon. The decrease is a result of the changing position of the moon in relation to the sun and Earth.


How do you know if the moon is increasing or decreasing in the amount of light?

You can tell if the moon is increasing or decreasing in light by observing its shape in the sky. During a waxing moon, it will appear to be growing larger, while during a waning moon, it will appear to be shrinking. Additionally, a waxing moon will be visible in the evening, while a waning moon will be visible in the morning.


What is the period when the amount of the lighted side that can be seen becomes smaller?

This period is known as the waning phase of the moon. During this phase, the illuminated portion of the moon visible from Earth decreases in size as it transitions from a full moon to a new moon.


When less and less of the lighted side of the moon becomes visible each night it is a what?

A waning moon


Is the underwater portion of an iceberg bigger than the portion that is visible above water?

No, typically the underwater portion of an iceberg is not bigger than the portion that is visible above water. Icebergs are known to have a larger portion underwater, but this is due to the difference in density between ice and seawater rather than the underwater portion being larger in size.


What portion of the engergy spectrum is visible light?

Visible light is in the portion of the electromagnetic spectrum between infrared (IR) and ultraviolet (UV) light.


Which portion of the electromagnetic spectum can be viewed with the bare human eye?

The visible light spectrum (wavelengths from 380 to 700 nanometers)


Is earth visible in morning or evening?

Earth is visible all the time to every human being.


How many days does it take for the same moon to reappear?

It's always the same moon, but the shape of the visible lighted portion changes. Whatever shape of the moon you see right now, you'll see the same shape again after 29.53 days have passed.