Chapter 29 Flashcards
Is round and three dimensional
Sphere
Ellipse
Is an elongated closed curve with two foci
What are some ancient fact that prove is a sphere
Objects fall towards the surface
The Shadow of the earth on the moon
People in different parts of the earth see different stars
What are two that affect gravitational pull
Mass and distance of an object
What does the magnetic field protect the earth from
Solar radiation
Which magnetic pull is located in the northern hemisphere
South magnetic pull
What what degree is earths axis tilted
11.7 degrees
What is the large scale movements where the magnetic pulls flip
Magnetic reversals
How often do magnetic reversals occur
200,000 years
Within earths magnetic field which deflects radiation
Magnetosphere
What are the scientific name of the northern and southern lights
Aurora borealis
Aurora Australis
How are the aurora lights created
Electrically-charged particles collide with atoms in the atmosphere and emit light
An area 15 degree wide in which the time is the same
Time zone
The spinning of earth on its axis, an imaginary line drawn from earths North Pole to its South Pole
Rotation
The motion of earth in an elliptical orbit around the sun
Revolution
The plane of earths orbit around the sun
Ecliptic
Earths rotational axis is perpendicular to a line drawn from the center of the earth to the center of the sun
Equinox
Occurs when earths rotational axis is tilted directly toward the sun or away from the sun
Solstice
Who devised a method of timekeeping around 3000 B.C
Babylonians
What was the symbol for degree taken from
The Babylonians from the sun
How many degrees does the earth spin in one day
360
How many hours does it take the earth to make one full rotation
24
How many degrees does the earth spin in one hour
15
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, they are modified to fit around cities, states, and country borders, and other key sites
How many time zones are there in the world
24
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 us
6
What are the names of the time zones
Atlantic/ Alaska Pacific Mountain Central Eastern Hawaiian
What is a solar day
Motion of the sun from sun at noon one day and sun at noon the next day
What is a sidereal day
See a certain stair over the horizon to the next day
What are the two main reasons for seasons
Revolution and the tilt of the axis
Which 2 seasons have a solstice
Winter and summer
Which month of s the summer solstice
June
Which month is the winter solstice
December
Which two seasons are equinox
Spring and fall
Which month is the spring equinox
March
Which month is the fall equinox
September
When is the longest day of the year
June 21
When is the shortest day of the year
December 21
When are the days almost 12 hours of day and 12 hours of night
Spring and fall equinox
March 21 or 22
September 22 or 23
Is a rise or fall in the ocean surface to rise
Tide
Reflects the change in appearance of the moon as seen from earth
Moon phase
Occurs when the moon moves directly between the sun and earth and casts a shadow on earth
Solar eclipse
Occurs when earth passes between the sun and the moon and casts a shadow on the moon
Lunar eclipse
The dark-colored, flat, lava-filled regions on the moons surface
Maria
A layer of dusty lunar material produced by collisions between asteroids and comets and the moon
Regolith
How many days does it take the moon to revolve around earth
27.3
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
What causes a ride 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 tides
Moon
How are the sun, the earth, and the moon aligned for a spring tide
The sun the earth and the moon are in a straight line
How are the sun, the earth, and the moon aligned for a neap tide
L aligned meant
What does the phase of the moon you see depend on
The positions of the moon, earth, and the 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
What is the definition of waxing phase
The illuminated portion that we see appears larger each night
What is the definition of waning phases
The illumination portion that we see begins to appear smaller
What are the moon phases names
New, waxing crescent, first quarter, waxing gibbous, full, waning gibbous, 3rd quarter, waning crescent
Where is the word month derived from
Old German word that means month
How is the earth, moon, and sun aligned during a solar eclipse
Sun moon earth
What is an umbra
Total solar eclipse
What is a penumbra
Partial eclipse
How is the earth, moon, and sun aligned during a lunar eclipse
Sun earth moon and happens at night time
How are the depressions on the moon formed
Meteorites, asteroids, and comets
Are there mountains on the moon
Yes they are formed by lava
Which side of the moon is thicker
Dark side
Is the mantle of the moon a solid or liquid
Solid
What did the Clementine spacecraft do (2 things)
Confirmed that the thickness the crust of the moon and provided info on the mineral content of the moon
What did the lunar prospector do (3 things)
Orbited the moon taking surface photos, confirmed the moon has a small iron rich core about 600 in, and supports the presence of water ice on the moon
What is the Giant Impact Theory
The moon formed about 4.6 billion years ago when a Mars-sized object collided with earth
