29.1 Flashcards
what 2 factors affect gravitational strength
the mass and the distance
which diameter of earth is longer
the diameter of the equator or the width of the earth
what does the magnetic field protect earth from
solar flares and harmful radiation from the sun
the south magnetic pol is located in which hemisphere
northern hemisphere
what degree is earths axis tilted at
11.7 degrees
do the magnetic poles reverse
yes
what is the large scale reversal called
magnetic reversals
how often do magnetic reversals occur
every 200,000
when was the last magnetic reversal
780,000 years ago
what is the part of the magnetic field that deflects harmful radiation from the sun
the magnetosphere
what are the northern lights and the southern light called
northern: aurora borials
southern; aurora austrialis
how are the arouras created
when electrically charged particals collides with atoms in the atmosphere and emit light
in which month is earth closest to the sun
in January
147 million km away
what is the shape of an elipse
andelongated closed curve with to foci
earths orbit is shaped like what
an elipse
when is earth farthest from the sun
in early July at 152 million km away
what is a time zone
is an area 15 degrees wide in which the time is the same
what is rotation
the spinning of the earth on its axis
what is a revolution
the motion of the earth in an elliptical orbit around the sun
what is the eliptic
defined as the plane of earths orbit around the sun
what is a solstice
occurs when earth rotational axis is tilted directly towards the sun or away from the sun
what is an equinox
when earths rotational axis is perpendicular to the line drawn from the center of the earth to the center of the sun
