Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
69 Cards in this Set
- Front
- Back
|
Earth's Rotation
|
Earth rotates eastward on it's axis. so the sun rises in the east and sets in the west
|
|
|
Earth's tilt
|
earths axis is tilted at a 23.5 degree angle; takes just over 365 days to orbit the sun(365.25); means diff parts of globe recieve diff amounts of light making the seasons.
|
|
|
spring equinox
|
day and night are each 12 hrs and sun is at midpoint in sky.
|
|
|
summer solstice
|
longest day of year when the sun is at the most nothern point in the sky
|
|
|
autumn equinox
|
day and night are 12 hrs and sun is at midpoint in the sky
|
|
|
winter solstice
|
shortest day of the year when the sun is at the most southern point in the sky
|
|
|
astronomy
|
study of moon stars and other objects in space
|
|
|
axis
|
imaginary line that passes through the earths center and north and south poles
|
|
|
revolution
|
movement of one object around another object
|
|
|
earth has seasons because...
|
axis is tilted and it revolves around the sun
|
|
|
solstice
|
the noon sun is overhead at 23.5 degrees north or south
|
|
|
equinox
|
noon sun is directly overhead at the equator
|
|
|
vernal equinox
|
march 21; marks beginning of spring in north hemi
|
|
|
autumnal equinox
|
sept 23; marks beginning of fall in north hemi
|
|
|
gravity
|
force that attracts all objects towards each other
|
|
|
Earth's Rotation
|
Earth rotates eastward on it's axis. so the sun rises in the east and sets in the west
|
|
|
Earth's tilt
|
earths axis is tilted at a 23.5 degree angle; takes just over 365 days to orbit the sun(365.25); means diff parts of globe recieve diff amounts of light making the seasons.
|
|
|
spring equinox
|
day and night are each 12 hrs and sun is at midpoint in sky.
|
|
|
summer solstice
|
longest day of year when the sun is at the most nothern point in the sky
|
|
|
autumn equinox
|
day and night are 12 hrs and sun is at midpoint in the sky
|
|
|
winter solstice
|
shortest day of the year when the sun is at the most southern point in the sky
|
|
|
astronomy
|
study of moon stars and other objects in space
|
|
|
axis
|
imaginary line that passes through the earths center and north and south poles
|
|
|
revolution
|
movement of one object around another object
|
|
|
earth has seasons because...
|
axis is tilted and it revolves around the sun
|
|
|
solstice
|
the noon sun is overhead at 23.5 degrees north or south
|
|
|
equinox
|
noon sun is directly overhead at the equator
|
|
|
vernal equinox
|
march 21; marks beginning of springin north hemi
|
|
|
autumnal equinox
|
sept 23; marks beginning of fall in north hemi
|
|
|
gravity
|
force that attracts all objects towards each other
|
|
|
law of universal gravitation
|
states every object attracts every other object
|
|
|
the strength of gravity...
|
is based on the size of the objects and the distance between them.
|
|
|
the larger the objects are...
|
the more gravitational pull
|
|
|
an objects weight depends on...
|
the gravitational pull on it
|
|
|
the farther apart the objects are...
|
the less gravitational forces on them
|
|
|
inertia
|
objects ability to resist change in motion
|
|
|
orbital motion
|
gravity and inertia keep earth in orbit around the sun and the moon in orbit around earth
|
|
|
the moon rotates...
|
once on its axis in the same amount of time it takes to revolve around the earth; causes us to see the same side of the moon every time.
|
|
|
phases
|
diff shapes of the moon; caused by how much sunlight is reflecting off the moons surface;
|
|
|
moon goes through whole set of phases as...
|
it makes a complete revolution around the earth.
|
|
|
New Moon
|
no moon present
|
|
|
Waxing Cresent
|
Moon starting to appear
|
|
|
First Quarter
|
Half of a sunlight moon
|
|
|
Waxing Gibbus
|
moon almost full in the sky
|
|
|
Full moon
|
entire sunlit sude facing earth.
|
|
|
Waning Gibbus
|
Moon begins to shrink
|
|
|
Third Quarter
|
You can see the other half of the moons sunlit surface
|
|
|
Waning Cresent
|
barely visible in sky.
|
|
|
how come a full moon and not an eclipse?
|
moon orbits earth at a five degree angle; during the full moon the sunlit side is below or above the earth.
|
|
|
moon orbit
|
the orbit is moving up and down; causes unusual tides and eclipses.
|
|
|
difference between lunar and solar eclipse?
|
lunar --> moon is in earth's shadow
solar --> earth is in moon's shadow |
|
|
lunar eclipse
|
when earth's shadow blocks the moon
|
|
|
solar eclipse
|
when moon's shadow blocks the earth
|
|
|
umbra
|
the darkest part of the shadow; no visible light
|
|
|
penumbra
|
less dark; some visible light present
|
|
|
total solar eclipse
|
very darkest of moons shadow; only visible in umbra; gets cold, gray color in the sky, stars come out;
|
|
|
partial solar eclipse
|
seen in penumbra; don't look directly at this one
|
|
|
anatomy of a lunar eclipse
|
total lunar eclipse only appears at full moon, sunlight is bent through earth's atmosphere and gives moon coppery glow
|
|
|
why must a lunar eclipse appear during a full moon
|
it has to be behind the earth, in the position of a full moon, except instead of above/below, it's in line with the earth.
|
|
|
tides are caused by...
|
the differences in gravitational forces between the water on earth and the moon
|
|
|
at any one time on earth...
(tide cycle) |
there are two places with low tides and two places with high tides (4 in total)
|
|
|
high tides are always...
|
in line with the moon
|
|
|
tide cycle occurs every...
|
25 hours
|
|
|
sun's gravity also...
|
pulls on earth's waters
|
|
|
one high tide
|
between moon and earth
|
|
|
second high tide
|
opposite side of earth; caused by water left behind
|
|
|
low tides
|
occur in between the two high tides.
|
|
|
spring tides
|
occur when sun and moon are in line and both pulling on earth's waters.[full moon or new moon]; have the greatest difference between high and low tides.
|
|
|
neap tides
|
occur when sun and moon make a 90 degree angle causes the least difference between high and low tides.
|
