Presentasi Inggris tentang Bumi secara Umum
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Transcript of Presentasi Inggris tentang Bumi secara Umum
O2
EARTH
WHAT IS EARTH?
What is Earth?
What is the earth made of?
Facts of Earth
Structure of the Earth
Earth Rotation and Revolution
What is Earth?
Earth is the third planet from the sun
What is the earth made of?
Structure of the earth
Earth Rotation
Rotation of the Earth
• Rotation means “to spin.” Earth rotates on its axis (an imaginary line running through the center of the Earth from the North Pole to the South Pole).
• Earth completes 1 rotation (spin) every 24 hours.
Day and Night
• Question: What causes day and night on Earth? • Answer: Day and night are caused by Earth’s rotation (spin)
on its axis. When ½ of the Earth is facing the sun it is DAY. When ½ of the Earth is facing away from the sun it is NIGHT.
Earth Revolution
Revolution of the Earth
• Revolution means “to go around something.”• A synonym for revolution is orbit. (revolution = orbit)• The Earth revolves (goes around) the sun counterclockwise.• It takes Earth 365 days (or 1 year) to make one complete
revolution around the sun.
The Seasons• Question: What causes the seasons on Earth?• Answer: Earth’s seasons are caused by 1) Earth’s titled axis
and 2) Earth’s revolution (orbit) around the sun. When the Northern Hemisphere(Half of the earth) is tilted toward the sun we have summer. When the Northern Hemisphere is titled away from the sun we have winter.
Facts of Earth
SPACEThere Are Not 24 Hours In a Day
23 hours, 56 minutes, and 4 second – the time it takes earth to rotate on its axis,
called sideral day
Earth Is Smoother than Bowling ballHigh mountains and deep ocean trenches
make up only 1/5000th of the earth circumference
1 Object a DayNASA (National Aeronautics and Space
Administration)estimates on average, that one piece of space junk returns to earth each day
ATMOSPHERE
100 TONSOf small meteorites mainly
fragments of dust , enter the earth’s atmosphere every day.
8.6 MILLIONLightning strikes a
day
The Ozon Hole Is ShrinkingIn 2012, the hole in the layer was smaller than it has ever been in
the last 10 year
SEAWATER ON EARTH IS
97% Salted3% Fresh
90%Of all volcanic activity occurs in the ocean
10.9 KMThe depth of the deepest area of the
ocean : The Mariana Trench
UNDER EARTHEarth Is The Only Planet in our Solar
System with plate techtonicWithout them, carbon wouldn’t be
consumed and recycled. And the earth would overheat (just like Venus)
99% of Earth’s Gold lies in its CoreEnough to form 1.5-foot coat around the
surface of the earth.
2.8 KM/1.7 MILESThe depth at witch bacteria have
been found. They survive by using radioactivity from uranium to
convert water to usable energy
Message from Earth