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
