CH 29.1

Question 1

is a round, three dimensional object, the surface of which is the same distance from center in all directions

Answer 1

sphere

Question 2

is elongated, closed curve with two foci

Answer 2

ellipse

Question 3

is earth a perfect sphere

Answer 3

no the width is longer than the height

Question 4

what are some ancient observation that proves earth is a sphere

Answer 4

no matter where you are at an object falls like if it was falling towards the center of a sphere, the shadow of earth on the moon during a lunar eclipse is always curve, we all see different stars

Question 5

what are two factors that effect gravitational strength??????????

Answer 5

the mass, and the distance

Question 6

which diameter of earth from pole pole or through the equator

Answer 6

diameter of the equator

Question 7

what does the magnetic field protect earth from

Answer 7

solar flares, harmful radiation from the sun

Question 8

the south magnetic pole is located in which hemisphere

Answer 8

north hemisphere

Question 8

the south magnetic pole is located in which hemisphere

Answer 8

north hemisphere

Question 9

the north magnetic pole is located in which hemisphere

Answer 9

south hemisphere

Question 10

what degree is earth axis titled at

Answer 10

11.7 degree

Question 11

do the magnetic poles reverse

Answer 11

yes they do

Question 12

what is the large scale reversals called

Answer 12

magnetic reversals

Question 13

how often do magnetic reversals occur

Answer 13

200,000 years

Question 14

when was the last magnetic reversal

Answer 14

780,000 years ago

Question 15

what is the part of the magnetic field deflects harmful radiation from the sun

Answer 15

the magneto sphere

Question 16

what is the southern lights and the northern lights called

Answer 16

the Aurora borealis (northern lights) Aurora austrails (southern lights

Question 17

how are the auroras created

Answer 17

electricity charged particles collides with atoms in the atmosphere and emit light

Question 18

in which month is earth closest to the sun

Question 18

in which month is earth closest to the sun

Answer 18

January(147 million km away)

Question 19

during which month are we furthest from the sun

Answer 19

july( 152 million km away)

Question 20

an area 15 degree wide in which the time is the same

Answer 20

time zone

Question 21

is the spinning of Earth on its axis

Answer 21

rotation

Question 22

is the motion of Earth in an elliptical orbit around the sun

Answer 22

revolution

Question 23

defined as the plane of Earth's orbit around the sun

Answer 23

ecliptic

Question 24

occurs when Earth's rotational axis is tilted directly toward the sun or away from the sun

Answer 24

solstice

Question 25

Earth's rotational axis is perpendicular to a line drawn from the center of Earth to the center of the sun

Answer 25

equinox

Question 26

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

Answer 26

the Babylonians

Question 27

what was the symbol for degree taken from

Answer 27

it was the symbol for the sun

Question 28

how many degrees does earth spin in one day

Answer 28

360 degrees

Question 29

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

Answer 29

24 hours

Question 30

what direction does the sun rise

Answer 30

west

Question 31

what direction does the earth set

Answer 31

east

Question 32

true or false; all time zones are the exact same size

Answer 32

false they are modified to fit around cities, states, and country borders, and other key cities

Question 33

how many time zone are there in the united states

Answer 33

6 time zones

Question 34

what are the names of the time zones

Answer 34

pacific time, mountain time, eastern time, central time, Atlantic time, Hawaiian time

Question 35

what is a solar day

Answer 35

is the movement of the sun from noon one day until noon the next day

Question 36

what is a sidereal day

Answer 36

where we look at a specific start and make a full rotation to the same star the next day

Question 37

what are the two main reasons for seasons

Answer 37

the title of the earth and the revolution

Question 38

which two seasons have a solstice

Question 39

which month is the summer solstice

Question 40

which month is the winter solstice

Question 41

which two seasons are equinox

Question 42

which month is the spring equinox

Question 43

which month is fall equinox

Question 44

when is the longest day of the year

Question 45

when in the shortest day of the year

Question 46

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

Question 47

how many degrees does the earth spin in one hour

Answer 47

15 degrees

Question 48

how many time zones are there in the world

Answer 48

24 zones

Question 49

what direction do you move to add hours to the time

Answer 49

east

Question 50

what direction do you move to subtract hours to the time

Answer 50

west