Why does the moon appear to change shape?

a: it rotates and makes it own light

b: it moves closer and farther away from the earth in a yearly pattern.

c: it reflects sunlight as it revolves around the earth.

d: it stays in one position as the earth moves.

The reason the moon appears to change is because

B: It moves closer and farther away from the earth in a yearly pattern.

Explanation: The Moon appears to change shape because we see different amounts of the lit part as the Moon orbits Earth.

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day