The Earth Flashcards
1
Q
Describe the shape of the earth
A
Flattened at the poles , budges at the equator
2
Q
What do we call the shape of the earth
A
Geoid
3
Q
What is the equatorial diameter
A
12 755
4
Q
What is the polar diameter
A
12 713
5
Q
What is the polar circumstance
A
40 008
6
Q
What is the Equatorial circumfrance
A
40 077
7
Q
What is the earths 2 types of movement
A
Rotation and Revolution
8
Q
What is rotation
A
The earth spins on its axis once every 24 hours
9
Q
What is revolution
A
The earth moves around the sun once every 365 and a quarter days
10
Q
Where does the earth rotate from
A
West to east
11
Q
How long does a rotation take
A
24 hours
12
Q
What does the rotation of the earth cause
A
Day and night
13
Q
Why does half of the earth receive sun at a time
A
The earth is a sphere
14
Q
What does the earth follow around the sun
A
An elliptical movement around the sun
15
Q
What are the 5 factors causing seasons
A
The earth is a sphere (half receives sun at a time )
Earth rotates on its own axis
Earths axis is tilted
Earths axis always parrallel to previous position
Earth revolves around the sun
16
Q
What is a solstice
A
Northern or Southern Hemisphere tilted towards sun , receiving direct rays
17
Q
When is the Southern Hemispheres winter solstice
A
21st June
18
Q
When is the northern hemispheres summer solstice
A
21st June
19
Q
When is the northern hemisphere winter solstice
A
22 December
20
Q
When is the Southern Hemisphere summer solstice
A
22 dec
21
Q
Why is 22 dec Southern Hemispheres summer solstice
A
Suns rays directly over Tropic of Capricorn
22
Q
What is a Equinox
A
Suns rays directly on equator , days and nights of equal length
23
Q
When is the Southern Hemispheres autumn equinoxes
A
21st March
24
Q
When is the NH spring equinox
A
21st March
25
When is NH autumn equinox
22 September
26
When is SH spring equinoxes
22 dec
27
What is the order of seasons
Summer , autum , winter , spring
28
Where do lines of latitude run from
East to west
29
What are lines of latitude known as
Parrallels
30
What is the most important line of latitude
Equator
31
Why do lines of latitude never touch
They are parrallel
32
How many Lines of latitude
180
33
What does latitude divide the world into
Northern and southern
34
What is the greatest circle of latitude lines
Equator
35
What is 90 north
North Pole
36
What is 66 ,5 north
Arctic circle
37
What is 23,5 north
Tropic of Cancer
38
What is 0
Equator
39
What is 23,5 south
Tropic of Capricorn
40
What is 66,5 south
Antarctic circle
41
What is 90 degrees south
South Pole
42
Where do lines of longitude run from
North to south
43
What are lines of longitude known as
Meridians
44
What is the most important line of longitude
Prime meridian
45
Where do lines of longitude touch
At the poles
46
Where are lines of longitude furthest away at
The equator
47
How many lines of longitude
360
48
What does longitude dived the world into
Western and eastern
49
What do lines of longitude form
Half a great circle
50
What are the two different lines of longitude
Prime meridian , international date line
51
Is the earth completely round
No
52
What is the diameter of the moon
3476km
53
Is there moon or earth bigger
The earth
54
What does the moon follow
And elliptical orbit around the earth
55
What do the earth and moon do together
Revolve around eachother
56
What is the common center of gravity between moon and earth
Barrycentre
57
What does the moon reflect off the sun
Light
58
How long does it take for the moon to revolve around the earth ? What month is this
27 and a half days , sidereal month
59
How long does it take from full moon to full moon , what month
29 and a half days , lunar / synodic month
60
What are the effects of the moon
Eclipses and tides
61
What ability does the moon have
The ability to grow thicker and thinner
62
What is it called when the moon gets bigger
Waxing crescent
63
What is it called when the moon gets smaller
Waning crescent
64
Why is this new moon indivisible
Part facing earth is in shadow
65
Which day is the waxing crescent moon
3 and a half days
66
Which day is the first quarter moon
7 and a half days
67
Which day is the waxing gibbous moon
11 and a quarter days
68
Which day is the full moon
14 and three quarter days
69
Which day is the waning gibbous moon
18 and a half days
70
Which day is the third quarter moon
22 and a half days
71
Which day is the waning crescent moon
26 days
72
When do eclipses occur
When the sun , moon and earth are in conjunction
73
What is conjunction
A straight line
74
How many eclipses are there and what are they called
2 , solar and lunar eclipse
75
When does a solar eclipse occur
When the moon moves directly between sun and earth
76
What does the moon do during a solar eclipse
Blocks out the sun , causes a shadow on the earths surface
77
What will happen if you are standing on earth where the shadow falls
You will see the moon blocking out all the light
78
What is a penumbra
A partial eclipse
79
What is an umbra
Total shadow
80
How many solar eclipses are there and what are they called
3. Partial eclipse , total eclipse , annular eclipse
81
What is a partial eclipse
Moon gets slightly in the way
82
What is a total eclipse
Moon completely blocks out sun
83
What is an annular eclipse
Moons at its furthest distance away from us . It appears a bit to small to cover the sun
84
Where can total solar eclipses be seen from on earth
Small part of the earth
85
How many solar eclipses every year
2-5
86
What happens to the weather during a solar eclipse
Sun dissapears, in the middle of the day
Tempreature gets cooler
Wind drops
87
When does a lunar eclipse occur
When the earth moves directly between sun and moon
88
What causes a shadow over the moon during a lunar eclipse
The earth blocks out the sun , causing a shadow over the moon
89
If we look at the moon during a lunar eclipse what will we see
A round black shape slowly creeping across it ( earth shadow)
90
What is a partial lunar eclipse
Shadows slightly covers moon
91
What is a total lunar eclipse
Shadow completely engulfs moon
92
How long can a lunar eclipse last for
A few hours
93
How many lunar eclipses are there every year
1-2
94
What is the colour of earth during a full lunar eclipse
Dark reddish gold colour
95
How often do tides take place
Every 12 hours
96
What is the time difference between low and high tides
6 hours
97
Why is the actual time of tides slightly different each day
The moon is revolving around the earth
98
How are tides useful for humans
Low tides rocks are exposes , sea animals are exposed
| High tides rocks are covered , you can catch fish as brought closer to shore
99
What are the 2 factors for tides
Earth rotates and forces sea away from its surface
| The moons gravitational force pulls the ocean
100
What force causes the ocean to budge which causes high tides
Centrifugal forces
101
What does centripedal mean
Pulling together
102
What does centrifugal mean
Pulling away
103
How does the moons gravitational pull attract the ocean
The moon has twice as much pull on the earths surfaces compared to the sun , because the distance between earth and moon is smaller
104
How many tides are there and what are they called
2 spring and Neap tides
105
What is a spring tide
When the moon and sun are in conjunction the forces of gravity are much stronger
106
What is conjunction
A straight line
107
What happens to the tides during a spring tide
High tides are higher
| Low tides are lower
108
What is the difference between tides during a spring tide
There is a big difference
109
What is A Neap tide
When the moon and sun are at right angles to the earth the forces of gravity are much weaker
110
What happens to the tides during neap tides
High tides are lower
| Low tides are higher
111
What is the difference between tides during neap tides
Tidal range is much smaller
112
How could tides generate electricity
Wave paddles are moved by the water and kinetic energy is turned into electrical energy
113
Why is the moon visible at night
The reason that you see moon is that it reflects light from the sun. ... Night is defined as the time of day when the sun is not visible. The earth has spun around so you're facing away from the sun at night
114
Why is the moon red during a lunar eclipse
You can credit Earth's atmosphere with providing an orangish color to the moon during an eclipse. The atmosphere acts like a filtered lens. It bends red sunlight into our planet's shadow and scatters out blue light. It's the same reason why sunrises and sunsets appear reddish
