Earth

Which of these pairs of elements was discovered before the 14th century?

More Questions from Earth
How are pockets of air in soil made?
Reveal Answer
How many times does lightning strike the Earth every second?
Reveal Answer
What percentage of the earth's water is drinkable?
Reveal Answer
What is another name for Mt. Kilimanjaro?
Reveal Answer
On October 11, 1999 the world population hit a milestone of how many?
Reveal Answer
Which of these is not a metamorphic rock?
Reveal Answer
The coldest recorded temperature on Earth, -128 degrees F., was taken where?
Reveal Answer
What is the Hawaiian name for smooth-flowing basaltic lava, often appearing twisted and rope-like?
Reveal Answer