What Do You Know About the EARTH?

 The Earth, the most extraordinary planet we know about, full of life and change. This world is alive, and our whole history is written into its very ground. How much do you know about the home that carries us through space?
 
 
According to scientists, how old is our planet?
4.5 billion years
13.7 billion years
400 million years
800 million years
 
 
True or False: The shape of the Earth is a perfect sphere.
It is actually more of a oblate spheroid.
True
False
 
 
The speed of 67,000 mph (107,826 kph) represents the speed of what?
Earth's orbit around the sun
Earth's rotation around its axis
Earth's movement through the galaxy
 
 
Where is the lowest point of the planet that's on land?
The dead sea is 413 meters below sea level,
The Dead Sea, Israel
Sea of Galilee, Israel
Caspian Sea
The Fens, UK
 
 
Besides trees, where does most of our breathable oxygen come from?
Oceanic phytoplankton
Grass
Lightning Storms
Bushes
 
 
How much of the world’s oxygen is produced by just the Amazon rainforest?
10%
5%
2%
20%
 
 
What two metals make up the Earth's core?
The outer core is liquid, the inner core is solid - and they're both made of iron and nickel
Iron and Nickel
Lead and Platinum
Gold and copper
Iron and silver
 
 
What is the outer layer of the Earth ground called?
The crust is divided into giant plates that fit together like a puzzle
The mantle
The core
The crust
The atmosphere
 
 
How hot is the Earth's inner core?
Temperature in the inner core is about 5,200° Celsius (9,392° Fahrenheit).
As hot as the surface of the sun
Hotter than the surface of the sun
Hotter than the core of the sun
As hot as the sun's core itself
 
 
How often does lightning strike the Earth?
Every second, 50 lightning bolts are hitting the earth.
500 times an hour
200 times a minute
1,000 times a day
50 times a second
 
 
What name is given to the Earth's lowest layer of atmosphere?
Stratosphere
Thermosphere
Troposphere
Exosphere
 
 
Which land-based ecosystem holds the most biodiversity of animals and plants?
They are home to about 50% of all living species!
Tropical forests
Swamp land
African Savannah
Coral reefs
 
Shall We Try Again?
Seems like you need to learn a little more about this planet we call home. Perhaps you'd like to try your hand again and take the quiz a second time? If not, look at our answers to learn from them.
 
You Did Well
You know a LOT about the Earth! You may not have completely aced this quiz, but there is only a little room for improvement. Perhaps you'd like to try your hand again and take the quiz a second time? If not, look at our answers to learn from them.
 
You Aced It!
The Earth is your oyster! You know very well what kind of planet you live on, how it's structured and a plethora of details about it! We're very impressed with your knowledge of our planet. Keep it up!
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