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Flashcards in Everything Earth! Deck (243)
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1

What is the mean diameter of the Earth?

13,000km

2

Is the Earth's crust made up of solid, plastic or liquid?

Solid

3

Is the Earth's mantle made up of solid, plastic or liquid?

Liquid

4

Is the Earth's outer core made up of solid, plastic or liquid?

Plastic

5

Is the Earth's inner core made up of solid, plastic or liquid?

Solid

6

Is latitude vertical or horizontal?

Horizontal

7

Is longitude vertical or horizontal?

Vertical

8

What is the range of latitude?

90°N to 90°S

Due to the Earth's rotation on its axis

9

What is the range of longitudes?

180°W to 180°E

10

What are the 2 possible longitudes of the International Date Line?

180°W or 180°E

11

What is the longitude of Greenwich (Prime Meridian)?

12

What is the latitude of the North pole, and what is its astronomical significance?

90°N, it's the axis of Earth's rotation

13

What is the latitude of the South pole, and what is its astronomical significance?

90°S, it's the axis of the Earth's rotation

14

At the equator, and what 2 days is the Sun at zenith at noon?

Spring and Autumn equinox

15

What is the latitude of the Tropic of Cancer?

23.5°N

16

What is the latitude of the Tropic of Capricorn?

23.5°S

17

At the Tropic of Cancer, what day is the sun at zenith at noon?

Summer solstice

18

What is the zenith?

The point in the sky directly above the observer

19

At the Tropic of Capricorn, what day is the sun at zenith at noon?

Winter solstice

20

What is the latitude of the Arctic Circle?

66.5°N

21

What is the latitude of the Antarctic Circle?

66.5°S

22

Describe what happens to the Sun on Summer Solstice in the Arctic Circle?

The Sun does not set

23

Describe what happens to the Sun on Winter Solstice in the Arctic Circle?

The Sun does not rise

24

Describe what happens to the Sun on Summer Solstice in the Antarctic Circle?

The Sun does not set

25

Describe what happens to the Sun on Winter Solstice in the Antarctic Circle?

The Sun does not rise

26

What is the angle of the Earth axial tilt?

23.5°

27

What is the percentage composition of the Earth's atmosphere?

78% Nitrogen
21% Oxygen
1% Water Vapour
1% Argon
0.04% Carbon Dioxide

28

What are the 5 benefits of the Earth's atmosphere?

-Respiration
-Absorbs UV/Ozone
-Absorbs X-ray and γ-ray (gamma rays)
-Regulates and moderates temperatures
-Partly protects us from small meteoroids

29

What are the 3 drawbacks of the Earth's atmosphere?

-Refraction
-Absorption
-Selective (Raleigh) scattering

30

Describe why refraction is a drawback of the Earth's atmosphere

It changes the position of objects in the sky, making it difficult to measure angles