Chapter 29.3 Flashcards
tide
is a rise or fall in the ocean surface
moon phase
reflects the change in appearance of the moon as seen from earth
solar eclipse
occurs when the moon moves directly between the sun and earth and casts a shadow on earth
lunar eclipse
occurs when earth passes between the sun and the moon and casts a shadow on the moon
maria
are the dark- colored, flat, lava- filled regions on the moons surface
regolith
is a layer of dusty lunar material produced by collisions between asteroids and comets and the moon
how many days does it take the moon to revolve around earth?
27.3 days
a complete lunar phase cycle takes 29.5 days, what is this called?
synodic month
do we ever see the back side of the moon?
no only one side
what causes a tide to rise or fall?
the gravitational pull of the sun and the moon
what is the rise of sea level called?
high tide
after the sea level rises how many hours does it take for the sea level drop?
6 hours
which is farther from earth,the sun or the moon?
sun
does the moon or the sun cause a greater effect on earth’s tides?
moon
how are the sun, the earth, and the moon aligned for a spring tide?
straight line
how are the sun, earth, and the moon aligned for a neap tide?
90 degree angle
what does the phrase of the moon you see depend on?
positions of the moon, earth, and sun relative to one another
when does a new moon occur?
when the moon is between the earth and the sun
how many phases of the moon are there?
8 phases
what is the definition of waxing phases?
when the illuminated portion that we see appears larger each night
what is the definition of waning phases?
when the illuminated portion that we see begins to appear smaller
what are the moon phase names?
- new moon
- waxing crescent
- 1st quarter
- waxing gibbous
- full moon
- waning gibbous
- 3rd quarter
- waning crescent
where is the word month derived from?
the same root word as Moon
how is the earth, moon, and sun aligned during a solar eclipse?
when the moon moves directly between the sun and earth and casts a shadow on part of Earth
what is an umbra?
the darkest portion of the moon’s shadow
what is a penumbra?
the partially shaded outer region of the shadow cast by an opaque object
How is the earth,moon, and sun aligned during a lunar eclipse?
when only a portion of the moon moves into earths umbra
how are the depressions on the moon formed?
- meteorites
- asteroids
- comets
Are there mountains on the moon?
yes
which side of the moon is thicker?
dark side - back side
is the mantle of the moon a solid or a liquid?
solid
what did the Clementine spacecraft do? (2 things)
- confirmed the thickness of the crust
- provided information of mineral content of moon rocks
what did the Lunar Prospector do? (3 things)
- took photos of the moons surface
- has a small iron- rich core
- collected evidence of water ice
what is the Giant Impact Theory?
where scientists thought that a mars side object collided the earth caused debris thrown into orbit that debris condensed into a large mass so called the moon
