ch 29 Flashcards
sphere
is a round, three dimensional object
ellipse
is an elongated, closed curve with two foci
what were some ancient observations to prove the earth is a sphere=-
objects fall down towards to the surface to the shadow of the moon and people form from different parts of the earth see different stars
what are two factors that affect gravitational pull
the mass of the object of and the distance
what diameter of earth is longer
equator
what does the magnetic field protect the earth from
harmful radation
which magnetic pole is located in the hemisphere
the south magnetic pole
at what degrees is earths axis titled
11.7
when was the last magnetic reversal
200,000 years ago
within earth’s magnetic field what part has left solar radiation
magnetosphere
what are the scientific names of the northern lights and the southern lights
aurora borealis and aurora austrialis
who devised a method of timekeeping around 3000 B.C
the babylonians
What was the symbol for degrees taken from
taken from the Babylonians from the symbol of the sun
how many degrees does the earth spin in one day
360 degrees
how many hours does it take the earth to make one full rotation
24 hours
how many degrees does the earth spin in one in hour
15 degrees
what direction does the sun rise
east
what direction does the sun set
west
true or false. All time zones are the exact same size
false
how many time zones are therein the world
24 time zones
which direction do you move to add hours to the time
east
which direction do you move to subtract hours from the time
west
how many time zones are there in the united states`
six time zones
what are the name of the time zones
Eastern, Pacific , Central America, Central , Hawaiian/mountainous time zone
what is solar day
the time between successive meridian transits of the sun at a particular place.
what is sidereal day
the time between two consecutive transits of the First Point of Aries
what are two main reasons for seasons
the tilt of a planet’s axis and its orbit around the sun.
which 2 seasons have a solstice
summer and winter
which month is the summer solstice
june
which month is the winter solstice
December
which two season are the equinox
March and September
which month is the spring equinox
march
which month is the fall equinox
september
when is the longest day of the year
Tuesday, June 21
when is the shortest day of the year
Wednesday, December 21
when are the days almost 12 hours of day and 12 hours of night
September 22
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 the earth
lunar eclipse
occurs when earth passes between the sun and the moon and casts a shadow and on the moon
maria
are the dark colored flat, lava-filled regions on the moon’s 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 the earth
27 days
a completer lunar phase cycle takes 29.5, what is this called
synodic month
do we ever see the back side of the moon
no
what causes a tide to rise or fall
the gravitational forces exerted on the earth by the moon, and to a lesser extent, the sun
what is the rise of sea level called
high tide
after the sea level rise how many hours does it take the sea level to drop
six
which is further from earth the sun or the moon
sun
does the moon or the sun cause a greater effect on the earth
the sun’s gravitational attraction to the Earth is more than 177 times greater than that of the moon to the Earth
how are the sun, the earth, and the moon aligned for a spring tide
the sun the moon and the earth aligned
how are the sun, the earth, and the moon aligned for a neap tide
an L
what does the phase of the moon you see depend on
the sunlight
when does a new moon occur
when the moon is the between the earth and the sun
how many phases of the moon are there
8
what is the definition of the waxing phase
the illuminated portion we see appears more
what is the definition waning phases
the illumination gets lets brighter
what are the moon phases name
new, wanning crescent, 3rd quarter, waxing gibbous, full, waxing gibbous, 1st quarter
where is the word month delivered from
a German word that means moon
how is the earth moon and the sun aligned for the solar eclipse
when moon is between the earth and the sun
what is umbra
is the shadow of the moon
what is penumbra
partial eclipse
how is the earth moon and the sun aligned during the lunar eclipse
sun moon earth
how are the depressions on the moon formed
from asteriods
are there mountains on the moon
yes
which side of the moon thicker
the dark side
is the mantle of the moon a solid or liquid
solid
what did the clementine spacecraft do
it confirmed the mineral content of moon rooks
what did the lunar prospector do
took surface photos of the moon confirmed the moon had a solid iron core of water and ice on the moon
