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physical science > ch29 > Flashcards

ch29 Flashcards

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Biology 101 flashcards
1
Q

who devised a method of timekeeping around 3000 b.c

A

Babylonians

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2
Q

what was the symbol for degree taken from

A

the Babylonian symbol for the sun

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3
Q

how many degrees does earth spin in one day

A

360

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4
Q

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

A

23 hours

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5
Q

how many degrees does earth spin in one hour

A

15 degrees

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6
Q

what direction does the sun rise

A

east

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7
Q

what direction does the sun set

A

west

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8
Q

true or false,all time zones are the exact sam size

A

false

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9
Q

how many time zones are in the world

A

24

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10
Q

what direction do you move to add hours to the time

A

clockwise

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11
Q

what direction do you move to subtract hours from time

A

counter clockwise

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12
Q

how many time zones are in the united states

A

6

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13
Q

what are the names of those time zones

A

Central Daylight Time,Mountain Daylight Time,Mountain Standard Time,Pacific Daylight Time,Alaska Daylight Time,Hawaii-Aleutian Standard Time

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14
Q

what is a solar day

A

time between successive meridian transits of the sun at a particular place.

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15
Q

what is a sidereal day

A

time between two consecutive transits of the First Point of Aries

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16
Q

what are the two main reasons for seasons

A

the tilt of a planet’s axis and its orbit around the sun.

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17
Q

which two seasons have a solstice

A

summer,and winter

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18
Q

which month has the summer solstice

A

june

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19
Q

what month is the winter solstice

A

december

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20
Q

which two seasons have equinoxes

A

spring,fall

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21
Q

what month is the spring equinox

A

march

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22
Q

what month is the fall equinox

A

september

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23
Q

what is the longest day of the year

A

june,21

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24
Q

what is the shortest day of the year

A

December 21

25
Q

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

A

march 21

26
Q

tide

A

the rise and fall of the oceans surface

27
Q

moon phase

A

reflects the change of the moon as seen from earth

28
Q

solar eclipse

A

when the moon moves between the sun and earth

29
Q

lunar eclipse

A

occurs when earth passes between the sun and moon

30
Q

maria

A

dark colored lava fillet regions on the moon

31
Q

regolith

A

layer of dusty lunar material produced by collisions of asteroids

32
Q

how many days does it take the moon to revolve around the earth

A

27.3 days

33
Q

a complete lunar eclipse cycle takes 29.5 days, what is it called

A

synodic month

34
Q

do we ever see the backside of the moon

A

no

35
Q

what causes the tide to rise and fall

A

gravitational force from the moon

36
Q

what is the rise of sea level called

A

relative sea level rise

37
Q

after the sea level rises how many hours does it take to drop

A

6 hours

38
Q

which is farther from the moon

A

the sun

39
Q

does the moon or sun cause greater effects on earth’s tides

A

moon

40
Q

how are the sun,earth,and moon aligned for spring tide

A

when the moon and sun pull together

41
Q

how are the sun,earth,and moon aligned for a neap tide

A

when the moon and sun pull opposite of each other

42
Q

what does the phase of the moon you see depend on

A

sunlight

43
Q

when does the new moon occur

A

when earth is between the moon and sun

44
Q

how many phases of the moon are there

A

eight

45
Q

what is the definition of waxing phase

A

where the moon apears larger each night

46
Q

what is the definition of the waning phase

A

the moon is less lit

47
Q

what are the moon phase names

A

new moon,waxing crescent,1st quarter,waxing gibbous,full.waning gibbous,3rd quarter,waning crescent

48
Q

where is the word month derived from

A

an old german word meaning moon

49
Q

how is the earth,moon,and sun aligned for a solar eclipse

A

with the moon between the earth and sun

50
Q

what is an umbra

A

the shadow from the moon

51
Q

what is a penumbra

A

brighter shadow from the moon

52
Q

how is the earth,moon,and sun aligned for a lunar eclipse

A

with the earth between the moon and the sun

53
Q

how are the depressions in the moon formed

A

meteors and asteroids,and comets

54
Q

are there mountains on the moon

A

yes

55
Q

which side of the moon is thicker

A

the darak side

56
Q

is the mantle of the moon liquid or solid

A

solid

57
Q

what did the clementine spacecraft do

A

confirmed thickness of moon crust and provided mineral content of moon rocks

58
Q

what did the lunar prospect do

A

took surface pics of the moon, confirmed the moon has a small iron core,evidence of water and ice on the moon

59
Q

what is the giant impact theory

A

the moon formed when a mars sized object hit earth

physical science (11 decks)

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