chapter 29.1

Question 1

sphere

Answer 1

is round and three dimensional

Question 2

ellipse

Answer 2

is an elongated closed curve with two foci

Question 3

what were some ancient facts to prove that earth is a sphere

Answer 3

objects fall down towards the surface , the shadow of the earth on the moon, and people in different parts of the earth see different stars

Question 4

what are two factors that affect gravitational pull

Answer 4

mass and distance

Question 5

what does magnetic field protect earth from

Answer 5

solar radiation

Question 6

which magnetic pole is located in the northern hemisphere

Answer 6

south pole

Question 7

wat what degrees is earths axis tilted

Answer 7

11.7 degrees

Question 8

what is the large scale movements where the magnetic poles flip

Answer 8

magnetic reversals

Question 9

how often do magnetic reversals occur

Answer 9

200,000 years

Question 10

within earths magnetic field which deflects radiation

Answer 10

magnetosphere

Question 11

what are the scientefic names of the southern and northern lights

Answer 11

aurora borealis and aurora asttrealis

Question 12

hows are the auroras created

Answer 12

electrically charged particles in the sun collide with atoms and emit light

Question 13

which month is earth closest to the sun

Answer 13

January

Question 14

time zone

Answer 14

area 15 degrees wide in which time is the same

Question 15

rotation

Answer 15

is the spinning of Earth spins its axis on an imaginary line

Question 16

is the motion of earth in an elliptical orbit

Answer 16

elliptical

Question 17

ecliptic

Answer 17

is defined as the plane of Earths orbit around the son

Question 18

solstice

Answer 18

occurs when earths rotational axis is tilted directly away the sun

Question 19

equinox

Answer 19

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

Question 20

who devised a method of timekeeping around 3000 B.C.

Answer 20

Babylonians

Question 21

what was the symbol for degree taken from

Answer 21

taken from the sun

Question 22

how many degrees does the earth spin in one day

Answer 22

360

Question 23

how many hours does it take the earth to make one full rotation

Answer 23

24 hours

Question 24

how many degrees does the earth spin in one hour

Question 25

what direction does the sun rise

Answer 25

east

Question 26

what direction does the sun set

Answer 26

west

Question 27

true or false all time zones are the exact same

Answer 27

false they are modified to fit around city’s states and country borders

Question 28

how many time zones are there in the world

Answer 28

24

Question 29

which direction do you move to add hours to the time

Answer 29

east

Question 30

which direction do you move to subtract hours from the time

Answer 30

north

Question 31

how many time zones are there in the united states

Answer 31

6

Question 32

what are the names of time zones

Answer 32

atlantic, pacific, mountain, central, eastern, and Hawaiian

Question 33

what is a solar day

Answer 33

motion of the sun from sun one day at noon and sun at noon the next day

Question 34

what is a sidereal day

Answer 34

whenever a star comes from the horizon to the next day

Question 35

what are two main reasons for seasons

Answer 35

revolution and the tilt of the axis

Question 36

which two seasons have a solstice

Answer 36

june 21st

Question 37

which month is the summer solstice

Question 38

which month is the winter solstice

Answer 38

december 21st

Question 39

which two seasons are equinoxes

Answer 39

spring and fall

Question 40

which month is the spring equinox

Answer 40

march

Question 41

which month is the fall equinox

Answer 41

september

Question 42

when is the longest day of the year

Answer 42

summer solstice

Question 43

when is the shortest day of the year

Answer 43

december 21st

Question 44

when are the days almost 12 hours of day and 12 hours of night

Answer 44

march 20-21 and september 22-23