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Astronomy > Topic 1- The Earth > Flashcards

Topic 1- The Earth Flashcards

1
Q

What is located at 66.5 degrees north

A

Artic circle

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2
Q

What is located at 23.5 degrees north

A

Tropic of Cancer

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3
Q

What is located at 0 degrees latitude

A

Equator

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4
Q

What is located at 23.5 degrees south

A

Tropic of Capricorn

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5
Q

What is located at 66.5 degrees south

A

Antarctic circle

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6
Q

What is located 90 degrees north

A

North Pole

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7
Q

What is 90 degrees south

A

South pole

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8
Q

What line of longitude is 0 degrees

A

Prime meridian

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9
Q

What is local glare

A

Comes from light sources from sports grounds, car parks, street lights and security light etc which ruins dark eye adaptions

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10
Q

What is sky glow

A

Rusty orange haze casted by lights from near towns an cities which reduces contrast between stars and the sky

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11
Q

Why is the sky blue

A

Light is scattered by oxygen and nitrogen particles in our atmosphere as blue light scatters more the sky appears blue

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12
Q

Why do stars appear to twinkle

A

Atmosphere refracts light which means the position and clarity of star viewing is less accurate movements in the atmosphere cause stars to twinkle

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13
Q

What is the shape of the earth

A

An oblate spheroid

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14
Q

What is the mean diameter of the earth

A

13000km

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15
Q

What are the internal division from surface to middle

A

Crust
Mantle
Outer core
Inner core

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16
Q

What does the altitude of the NCP equal

A

Latitude of observer

17
Q

What makes up the crust

A

Solid layer of tectonic plates composed of iron, oxygen, silicon,

18
Q

How thick is the crust

A

8-70 km of continental crust over 8km of oceanic crust

19
Q

What is the temperature of the crust

A

20 degrees Celsius

20
Q

How much does the mantle make up of the volume of earth

A

80 percent

21
Q

What is the thickness of the mantle

A

2900 km

22
Q

What is the temperature of the mantle

A

1400-3000 degrees Celsius

23
Q

What is the outer core made of

A

Liquid nickel and iron

24
Q

What does the outer core generate

A

Earth magnetic field current

25
Q

What is the thickness of the outer core

A

2900km

26
Q

What is the temperature of the outer core

A

3500-4000 degrees Celsius

27
Q

What is the inner core made out of

A

Liquid iron

28
Q

What is the thickness of the inner core

A

1200km

29
Q

What is the temperature of the inner core

A

5000-6000 degrees Celsius

30
Q

What does latitude measure

A

How far north or south something is goes from +90 degrees — -90 degrees

31
Q

What does longitude measure

A

How far west or east something is. Up to 180 degrees west or east

Astronomy (16 decks)

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