How many times can an aluminum can be recycled?
Forever
100 times
50 times
25 times
At what temperature does water reach its maximum density?
How many elements in the periodic table are naturally occurring?
What percentage of Earth's atmosphere is nitrogen?
At what temperature (in Fahrenheit) does paper spontaneously combust?
What is the pH level of pure water?
What percentage of the human body is water?
45-55%
55-65%
60-70%
75-85%
What percentage of salt in seawater is sodium chloride?
How long does it take for plastic to decompose in a landfill?
100 years
450 years
1000 years
Never fully decomposes
What percentage of your brain is fat?
At what temperature does gold melt?
1064°C
1464°C
1864°C
2064°C
How many chemical reactions occur in your body every second?
Thousands
Millions
Billions
Trillions
What percentage of the universe is dark matter?
How many atoms thick is a soap bubble wall?
1 atom
3 atoms
5 atoms
7 atoms
What percentage of a cucumber is water?
How many times more powerful is your sense of smell in the morning?
What temperature (in Celsius) is the center of the Earth?
4,000°C
5,000°C
6,000°C
7,000°C
How many chemical elements are required for life?
What percentage of table salt is chlorine?
