ch29

Question 1

sphere

Answer 1

a round,three dimensional object

Question 2

ellipse

Answer 2

an elongated closed curve with two foci

Question 3

provingnearth is round

Answer 3

objects fall to the center of earth

the earths shadow on the moon

Question 4

what are two factors that effect gravitational pull

Answer 4

mass and distance

Question 5

which diameter of earth is longer

Answer 5

the one from the equator

Question 6

what does the magnetic field protect earth from

Answer 6

harmful solar radiation

Question 7

which magnetic pole is located in the northern hemisphere

Answer 7

the south magnetic pole

Question 8

at what degrees is earths axis tilted

Answer 8

11.7 degrees

Question 9

can magnetic poles flip flop

Answer 9

yes

Question 10

what is it called when they flip

Answer 10

a magnetic reversal

Question 11

how often do magnetic reversals occur

Answer 11

200000 years

Question 12

when did the last magnetic reversal happen

Answer 12

780000

Question 13

within earths magnetic field what part deflects solar radation

Answer 13

the magnetosphere

Question 14

what are the scientific names of the norther and southern lights

Answer 14

the aurora borealis and the aurora austrialis

Question 15

how are the auroras created

Answer 15

charged sun particles colliding with the atmosphere

Question 16

which month is earth closest to the sun

Answer 16

January

Question 17

when are we farthest from the sun

Answer 17

in july

Question 18

time zone

Answer 18

an area 15 degrees wide in which time is the same

Question 19

rotation

Answer 19

the spinning of earth on an axis

Question 20

revolution

Answer 20

the motion of earth in an elliptical orbit

Question 21

ecliptic

Answer 21

a plane of earths orbit around the sun

Question 22

solstice

Answer 22

occurs when earths rotational axis is tilted directly towards or away from the sun

Question 23

equinox

Answer 23

earths rotational axis is in a perpendicular line drawn from the from the center of the sun