Unit 6 study guide

What elements compose the atmosphere?

• Argon

• Hydrogen

• Nitrogen

• Oxygen

Define Penumbra

• a space of partial illumination between the perfect shadow on all sides and the full light.

• The dark inner part of a shadow in which all light is blocked

Differentiate Partial Eclipse and Total Eclipse.

• During a partial lunar eclipse, the moon covers the sun's disk entirely, whereas in partial and annular lunar eclipses, the moon only blocks a part of the sun.

• During a total solar eclipse, the moon covers the sun's disk entirely, whereas in partial and annular solar eclipses, the moon only blocks a part of the sun.

The radius of the moon is about ________ of the radius of the earth.

• 4/5

• 1/4

• 1/3

• 2/3

Define Umbra

• a space of partial illumination between the perfect shadow on all sides and the full light.

• a conical shadow excluding all light from a given source

The moon’s mass is about _________ the mass of the earth.

• 2/6%

• 1.2%

• 2.3%

• 4.5%

Is Maria older or Highlands

• Highlands

• Maria

What moon phase does a solar eclipse occur in?

• new moon

• full moon

Why doesn’t an eclipse occur every full moon?

• the orbit of the moon is tilted relative to the orbit of the Earth around the sun, so the moon often passes below or above Earth.

• the orbit of the sun is tilted relative to the orbit of the Earth around the moon, so the sun often passes below or above Earth.

What moon phase does a lunar eclipse occur in?

• crescent moon

• new moon

• full moon

• waning moon