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Physical Science > CH 29.1 > Flashcards

CH 29.1 Flashcards

1
Q

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

A

sphere

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2
Q

is elongated, closed curve with two foci

A

ellipse

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3
Q

is earth a perfect sphere

A

no the width is longer than the height

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4
Q

what are some ancient observation that proves earth is a sphere

A

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

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5
Q

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

A

the mass, and the distance

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6
Q

which diameter of earth from pole pole or through the equator

A

diameter of the equator

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7
Q

what does the magnetic field protect earth from

A

solar flares, harmful radiation from the sun

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8
Q

the south magnetic pole is located in which hemisphere

A

north hemisphere

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8
Q

the south magnetic pole is located in which hemisphere

A

north hemisphere

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9
Q

the north magnetic pole is located in which hemisphere

A

south hemisphere

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10
Q

what degree is earth axis titled at

A

11.7 degree

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11
Q

do the magnetic poles reverse

A

yes they do

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12
Q

what is the large scale reversals called

A

magnetic reversals

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13
Q

how often do magnetic reversals occur

A

200,000 years

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14
Q

when was the last magnetic reversal

A

780,000 years ago

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15
Q

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

A

the magneto sphere

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16
Q

what is the southern lights and the northern lights called

A

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

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17
Q

how are the auroras created

A

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

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18
Q

in which month is earth closest to the sun

A
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18
Q

in which month is earth closest to the sun

A

January(147 million km away)

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19
Q

during which month are we furthest from the sun

A

july( 152 million km away)

20
Q

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

A

time zone

21
Q

is the spinning of Earth on its axis

A

rotation

22
Q

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

A

revolution

23
Q

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

A

ecliptic

24
Q

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

A

solstice

25
Q

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

A

equinox

26
Q

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

A

the Babylonians

27
Q

what was the symbol for degree taken from

A

it was the symbol for the sun

28
Q

how many degrees does earth spin in one day

A

360 degrees

29
Q

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

A

24 hours

30
Q

what direction does the sun rise

A

west

31
Q

what direction does the earth set

A

east

32
Q

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

A

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

33
Q

how many time zone are there in the united states

A

6 time zones

34
Q

what are the names of the time zones

A

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

35
Q

what is a solar day

A

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

36
Q

what is a sidereal day

A

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

37
Q

what are the two main reasons for seasons

A

the title of the earth and the revolution

38
Q

which two seasons have a solstice

A
39
Q

which month is the summer solstice

A
40
Q

which month is the winter solstice

A
41
Q

which two seasons are equinox

A
42
Q

which month is the spring equinox

A
43
Q

which month is fall equinox

A
44
Q

when is the longest day of the year

A
45
Q

when in the shortest day of the year

A
46
Q

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

A
47
Q

how many degrees does the earth spin in one hour

A

15 degrees

48
Q

how many time zones are there in the world

A

24 zones

49
Q

what direction do you move to add hours to the time

A

east

50
Q

what direction do you move to subtract hours to the time

A

west

Physical Science (12 decks)

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