Why does the moon change shape?

Why were ancient people amazed by the Moon?

• Its shape never changed

• Its shape seemed to constantly change

• Ancient people did not know what the moon was

What about this selection helps to identify it as expository text?

• The diagrams, historical drawings, and subheadings help to show that the text is explaining factual information.

• The words that the author wrote

• The written information about the moon

Reread page 339. What does the diagram show?

• how the moon appears over a 21-day period

• how the moon appears over a year

• how the Moon appears over a 29-day period

Reread page 338, what is the authors purpose in the third and fourth paragraph?

• to describe how the moon appears over the course of a month

• how amazed ancient people where with what they saw in the night sky

• How the moon shrinks and stays that way

What do all of the planets in our solar system have in common?

• they all have one more then 1 moon

• they all orbit around the sun

• they all take the same amount of time to circle around the sun

Why would Mercury take 277 fewer days than Earth to orbit the sun?

• it is the farthest from the sun

• It is closer to the sun so its path in orbit is far shorter

• Mercury is a lot bigger so its path in orbit is shorter

Which context clues help you to determine the meaning of “dwarf planets” in the first paragraph on page 341?

• Pluto; larger than asteroids

• rocky chunks called asteroids

• balanced with the pull of the sun's gravity

Why don’t the planets and other objects fly off into space away from the sun?

• they are too heavy to fly away into space

• Their forward movement is balanced by the pull of the Sun’s gravity.

• they are balanced by their own gravity

What is an asteroid?

• a rocky chunk in orbit between Mars and Jupiter

• a rock that floats through earths gravity

• many small rocks that float around the planets gravitational pull

What is a dwarf planet?

• a rock that is too far away to be considered a planet

• a planet that has no life

• a rocky chunk that is larger than an asteroid but smaller than a planet