Chapter 29.1 Flashcards
A sphere is a round, three-dimensional object.
Sphere
An elongated, closed curve with two foci.
Ellipse
What are some facts to proof that Earth is a sphere?
Objects fall straight towards the surface, the shadow on the moon, people all over the world see different stars.
What are 2 factors that affect gravity´s pull?
Mass and distance
Which diameter is
Equator
What does the magnetic field protect Earth from?
harmful radiation from the sun
Which magnetic pull is located in the northern pole?
south magnetic pole
Which magnetic pole is located in the northern pole
north magnetic pole
At what degrees is Earth tilted at?
11.7
Can magnetic poles flip-flop?
slowly over time
What is large scale movements called when the magnetic poles flip?
magnetic reversals
When was the last reversal?
200,000 years ago
What deflects harmful radiation from the sun?
the magnetosphere
What is the name of the northern lights and the southern lights?
northern lights- Aurora Borealis
southern lights- Aurora Australis
How are the Auroras created?
electrically-charged particles collide with atoms in the atmosphere and emit light
When is Earth closer to the sun?
January
When is Earth farther from the sun?
July
An area 15 degree wide in which the time is the same.
Time Zone
The spinning of Earth on its axis.
Rotation
The motion of Earth in an elliptical orbit around the sun.
Revolution
Is defined as the plane of Earth´s orbit around the Sun.
Ecliptic
Occurs when Earth´s rotational axis is tilted directly toward the Sun or away from the Sun.
Solstice
Earth´s rotational axis is perpendicular to a line drawn from the center of Earth to the center of the Sun.
Equinox
