29.1

Question 1

what are 2 things that effect gravitational forces

Answer 1

masses and distance

bigger and closer

Question 2

which diameter is longer (pole to pole/ along the equator)

Answer 2

along the equator

Question 3

what does the magnetic field do for Earth

Answer 3

protects us from harmful radiation

Question 4

which magnetic pole is in the northern hemisphere

Answer 4

south magnetic pole

Question 5

which magnetic pole is in the southern hemisphere

Answer 5

north magnetic pole

Question 6

can the magnetic poles flip

Answer 6

yes

Question 7

what degrees is earth’s axis tilted

Answer 7

11.7 degrees

Question 8

what is the flipping of magnetic poles called

Answer 8

magnetic reversal

Question 9

how often do magnetic reversals occur

Answer 9

200,000 years

Question 10

when was the last one

Answer 10

780,000 years ago

Question 11

what is a magnetosphere

Answer 11

deflects harmful radiation from the sun

Question 12

how are the auroras created?

Answer 12

electrically-charged partials collide w/ atoms in the atmosphere and emit light

Question 13

what is the scientific name for the northern hemisphere

Answer 13

aurora borealis

Question 14

what is the scientific name for the southern hemisphere

Answer 14

aurora austalis

Question 15

when is earth closest to the sun

Answer 15

early January (147 mil. km.)

Question 16

when is earth farthest from the sun

Answer 16

Early July (152 mil. km.)