Answer: The kind of test that can be performed to make sure that you are not accidentally trying to sell a fool's gold (iron pyrite) is called the Acid Test.
Explanation: This Acid test is performed by making a little scratch on the gold and adding drops of a liquid nitric acid on that spot, after adding the nitric acid, if the spot turns green it is a fake gold but if the spot is unaffected, it is a real gold.
Answer:
The elements are used because the half lives can denote when it was trapped in the rock.
Explanation:
The half lives of different elements can help to determine when the fossil was created and without it, it would be much harder to determine the ages of fossils.
Sputnik I and Sputnik II provided a D) Information about Earth's atmosphere.
The answer is C, dense snow. ;)
A, C and D are all correct answers
