Why Does the Moon Show Phases in the Course of a Month

question 18

Multiple Choice

Why does the Moon show phases in the course of a month?

• A) clouds get in the way of the Moon's light and cover up parts of it
• B) the Earth's shadow falls on the Moon to different degrees as the Moon goes around
• C) the angle the Moon makes with the Sun changes and we see differing amounts of reflected sunlight
• D) more or less light from the Earth is reflected as the Moon turns around it
• E) the Moon glows from the inside, and its various continents glow different amounts

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Definitions:

Cardiovascular Disease

A class of diseases that involve the heart or blood vessels, including coronary artery disease, hypertension, heart failure, and stroke.

Endocrine Gland

A gland that secretes hormones directly into the blood or tissue fluid instead of into ducts. Compare with exocrine gland.

Exocrine Gland

A gland that excretes its products through a duct that opens onto a free surface, such as the skin (e.g., sweat glands). Compare with endocrine gland.

Pancreas

A gland in the digestive and endocrine systems of vertebrates that produces digestive enzymes and hormones, including insulin.