ch 29.1 Flashcards
A round three-dimensional object
Sphere
A elongated closed curve with two foci
ellipse
Is earth a perfect sphere?
No because the width is longer than the height of it.
What are some enchant observations that prove earth is a sphere?
No matter where you are at on earth objects fall straight down to the surface as if they are falling toward the center of a sphere. second earth shadows on the moon during a lunar eclipse is a way curved. Finally people in different parts of the world see different stars above their horizon.
What are two factor’s that effect gravitational strength.
Mass & Distance
Which diameter of the earth pull to pull or the equator is longer?
The equator
What does the magnetic field protect earth from?
Harmful radiation from the sun
The south magnetic pull is located in which hemisphere?
Northern Hemisphere
What degree is earth axes tilted at?
11.7
Do the magnetic pulls revers?
Yes they do
What are the large scale reversals called?
Magnetic reversals
How often do magnet reversals occur?
2,000 years
When was the last magnet reversal?
780,000 years ago
What is the part of the magnetic field defects harmful radiation from the sun?
Magnetosphere
What is the part of the magnetic field defects harmful radiation from the sun?
Magnetosphere
