notes Flashcards
is the earth a perfect sphere
no
what are some ancient observations to prove that earth is a sphere?
No matter where you are at if you drop something it will drop to the ground. Earths shadow on the moon during a lunar eclipse is always curved.
what are two factors that effect gravitational strength?
mass and the distance
which diameter of earth is longer?
eaqator
what does the magnetic field protect earth from?
harmful radation
which south magnetic pole is located in which hemisphere?
Northern hemisphere
what degree is earths axis pointed at?
11.7 degrees
do the magnetic poles reverse?
yes they do
what are the large scale reversals called?
magnetic reversals
how often to magnetic reversals occur?
200,000 years
when was the last magnetic reversal?
800,000
what is the part of the magnetic field deflects
magnetosphere
what is the northern lights and the southern lights
how are the auroras created
in which months is earth closest to the sun?
January
147 million km away
