29.2 Flashcards
Time Zone
An are 15 degrees wide in which time is the same.
Rotation
Spinning of the Earth on its axis
Revolution
The motion of Earth in an elliptical orbit
Ecliptic
Defined as the plane of Earth’s orbit around the sun.
Solstice
Occurs when Earth’s rotational axis is tilted directly toward the Sun or away from the Sun.
Equinox
Earth’s rotational axis is perpendicular to a line drawn from the center of the Earth to the center of the Sun.
When is the earth furthest away from the sun?
July
When is the Earth closest to the sun?
January
How are auroras created?
Electrically charged particles collide with atoms in the atmosphere and emit light
Scientific name for the northern and southern lights?
Northern- Aurora Borealis
Southern- Aurora Australis
Within Earth’s magnetic field, deflects
Magnetosphere
When was the last magnetic reversal?
780,000 years ago
How often do magnetic reversals happen?
Every 200,000 years
What is it called when magnetic poles switch
Magnetic Reversals
Can magnetic poles flip
Yes
At what degree is Earth’s axis tilted
11.7 degrees
Which magnetic poles is located in the South Pole
North magnetic pole
Which magnetic pole is located in the north pole
In the south magnetic pole
What does the magnetic field protect the Earth from?
Harmful radiation
What are two factors that effect gravitational pull?
Mass and distance
Sphere
A round, three-dimensional object, the surface of which is the same distance from the center in all directions
Ellipse
an elonged, closed curve with two foci
Who devised a method of timekeeping around 300 B.C
Babylonians
What was the symbol for degree taken from?
Their symbol for the Sun
How many hours does it take the earth to make one full rotation?
24 hours
How many degrees does the earth spin in one 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?
a. 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 time zones
Which direction do you move to add hours to the time?
Which direction do you move to subtract hours from the time?
How many time zones are there in the United States?
6 time zones
What are the names of the time zones?
Atlantic/ Alaskan time zone Pacific time zone Mountain time zone Central time zone Eastern time zone Hawaiian time zone
What is a solar day?
When we look at the sun at noon one day to noon the next day
What is a sidereal day?
Look at a certain star above the hemisphere on night to the next night.
What are the two main reasons for the seasons?
Remind students that the two reasons seasons occur are the tilt of a planet’s axis and its orbit around the sun.
What two seasons have a solstice?
Winter and Summer
Which month is the summer solstice?
June 21st
Which month is the winter solstice?
December 21st
Which 2 seasons are equinoxes?
Spring and Fall
Which month is the spring equinox?
March 20/21
Which month is the fall equinox?
September 20/21
When is the longest day of the year?
Summer solstice, June 21st
When is the shortest day of the year?
Winter solstice, December 21st
When are the days almost 12 hours of day and 12 hours of night?
The equinoxes, March 21 or 22 and September 21 or 22 orrr 23
