Answer the Question about something you should know.

1. THE EARTH
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2. Contents
I. Our World
II. The Atmosphere
III. Time and Seasons
IV. Weather and Climate
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3. Our World
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4. 4
The Earth formed about 4600 mmiilllliioonn yyeeaarrss aaggoo..
The equatorial diameter of Earth is 1122,,775577
kkiilloommeetteerrss..
Weigh nearly 66000000 million million million tonnes.
The land covers 29% of the Earth’s surface.
71% is covers by the oceans and seas.

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Inside the Earth 1st layer call CCrruusstt ..
it is about 6 km deep to
Oceans.
2nd layer call MMaannttllee..
3rd layer call OOuutteerr ccoorree.. 4th layer call IInnnneerr ccoorree..
55000000 kkiilloommeetteerrss ..
TTeemmppeerraattuurree iiss 22880000 ooCC..

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 What are latitude and longitude?
• latitude and longitude are the lines marked on a map or
globe of the world.

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 WWhhyy iiss tthhee wwoorrlldd rroouunndd??
• When the Earth formed, it was hot and liquid.
• It become round because it was floating in space.
• When the liquid rock cooled and hardened into solid
rock, the Earth stayed round.

8. TThhee AAttmmoosspphheerree
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What is air made of ?
How much does air weigh?
AAiirr iiss mmaaddee ooff iinnvviissiibbllee ggaasseess..
You cannot see the gases, but
you can feel them when the
wind blows.
There is about 160 kilometers
of air above our head.

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Why is the sky blue?
Why is the sky red at
sunset?

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During the day, light from the sun travels through the
air to reach our eyes.
The white light of the Sun in fact consists of a mixture
of colors (colors of the rainbow)
The blue rays are scattered by the air and come to our
eyes from all angles in the sky. This makes the sky look
blue.

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As the sun begins to set, the light must travel farther through
the atmosphere before it gets to you.
More of the light is reflected and scattered. As less reaches you
directly, the sun appears less bright. The color of the sun itself
appears to change, first to orange and then to red.
This is because even more of the short wavelength blues and
greens are now scattered.
Only the longer wavelengths are left in the direct beam that
reaches your eyes.

12. The sky around the setting sun may take on many colors. The
most spectacular shows occur when the air contains many small
particles of dust or water.
These particles reflect light in all directions. Then, as some of the
light heads towards you, different amounts of the shorter
wavelength colors are scattered out.
 You see the longer wavelengths, and the sky appears red, pink or
orange.
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13. How many colors are there in a rainbow?
Can we see rainbow at night?
Where does a rainbow end?
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Rainbows colors are:
Violent light, indigo, blue, green, yellow, orange, red.
You can be seen rainbows at night. (MMoooonnlliigghhtt)
Rainbows form in falling rain and in clouds of spray when
sunlight falls on them. So, the rainbows is as far a way from you
as the rain or spray . To see a rainbow, the Sun must be behind
you.

15. TTiimmee aanndd SSeeaassoonnss
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Why do we have seasons ever
year?
Can the same day be both the
longest and shortest day of the
year?

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17. Weather and Climate
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Why does rain fall from the sky?

18. Why does lighting strike?
A flash of lighting is a huge spark of electricity.
During a thunderstorm, electric charges of millions of volts
build up in the clouds.
Electric charges build up on the ground too.
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19. How far away is thunder and lighting?
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20. Thanks
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