world geography Flashcards
the universe is always _______
expanding
t/f
the universe includes all planets in space
true
space is filled with stars, which make up _____
galaxies
stars together
galaxy
the galaxy that we live in is called the _____
Milky Way
our most visible star is ______
the Sun
our planets orbit the _____
Sun
what 2 groups are the planets separated into
inner(terrestrial)
outer(gas)
name the inner planets
mercury
venus
earth
mars
{smaller planets}name the outer planets
Jupiter
Saturn
Uranus
Neptune
Pluto
{larger planets}what does Au stand for
Astronomical unit
what is astronomical unit
distance from the earth to the sun
1 Au= ___ miles
93 million
the earth is about ___ smaller than the Sun
100x
the ___ is an average star
Sun
the sun stores ___ energy
solar
earth is ___ miles wide
8,000
earth has ___ moon(s)
one
the moon is ____ miles away from Earth
240,000
the_______ orbits around us every 29.5 days
moon
a leap year happens every ___ years
4
it takes earth ____ days to orbit Sun
365 1/4
the force that works between the sun earth and the moon
gravity
_____is our moon
Luna
what is the reason that we have day and night
we are rotating
Earth sits on a ____
axis
Earth rotates on _____
its axis
the Earth rotates and ____
revolves
how long does one complete spin of the earth on its axis
24 hours
the earth rotates in a ___ to ____ direction
west to east
what does 1/4 do every 4 years
makes a leap year
the Earth is tilted ____
23.5 degrees
tilt causes the north/south poles to be pointed towards or away from the ___ as its ____
sun
rotating
what causes us to have seasons
tilt
different points on earth get different amounts of ______
solar energy
warm, low latitude areas
tropics
cold, high latitude areas
polar regions
which season has long days
winter
what season has long days
summer
what seasons have distributions of sunlight
fall
spring
tropics are ___ most of the time
warm
tropics have ___ seasons
alternating wet/dry seasons
tilt causes the north and south hemispheres to have____ seasons at the _____
opposite
same time
what does equinoxes mean
equal notes
when do equinoxes occur
when the poles are pointed toward or away from the sun
when are the 2 solistes
December 21
June 21
dec. solstice-northern hemisphere
shortest day
first day of winter
dec. solistice-southern hemipshere
longest day
first day of summer
in the December solstics, anything ___ the artic circle gets no sunlight
below
anything below the antarctic circle gets ______ during the December solstice
24 hours of sunlight
june solstice-northern hemisphere
longest day
first day of summer
june solstice-southern hemisphere
shortest
first day of winter
in June solstice, arctic circle gets ____
24 hours on sunlight
in June solstice, antarctic circle will get _____
24 hours of no sunlight
when are the 2 equinoxes
march 21
sept 22
march equinoxe-n.h.
spring
march equinoxe-s.h.
fall
sept equinoxe-n.h.
fall
sept equinoxe-s.h.
spring
the universe is made up of _______
all existing things
