A great flood made by God.
If you look on openstudy.com they have lots of answers to this :-)
While race<span> and </span>ethnicity<span> share an ideology of common ancestry, they differ in several ways. First of all, </span>race<span> is primarily unitary. You can only have one </span>race<span>, while you can claim multiple </span>ethnic<span> affiliations. You can identify ethnically as Irish and Polish, but you have to be essentially either black or white.</span>
Answer:
An individual would be unable to observe the changes in the rock cycle, which can last for tens of thousands or even millions of years.
<em>I hope this helps you</em>
<em>:)</em>