Which is the main gas that makes up the Earth's atmosphere?
Nitrogen
Oxygen
Haydrojen
What name is given for the number of protons found in the nucleus of an atom?
Cell number
Electronic number
Atomic number
At what temperature are Celsius and Fahrenheit equal?
-40
-60
-70
How many teeth does an adult human have?
19
32
40
What is the biggest planet in our solar system?
Jupiter
Earth
Venus
Which famous British physicist wrote A Brief History of Time?
Stephen Hawking
Isaac Newton
Charles Darwin
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