One barrel of petroleum holds 42 gallons.
20
One cubic foot of gold weighs more than 1,200 pounds!
78
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71
For every gallon of sea water, you get more than a quarter pound of salt.
45
The sun is 330,330 times larger than the earth.
75
Iron weighs more after it rusts.
68