Answer: To date rocks geologists first give a relative age to a layer of rock at one location. Then they can give the same age to matching layers of rock at other locations. Certain fossils, called index fossils, help geologists match rock to layers.
Explanation:
We refer to this concept as "sea level". (answer D is the correct one)
Actually, the level of the sea is not constant and it's not the same everywhere, so we are talking here about the average sea level only.
Some places are located below the sea lever (for example some parts of the Netherlands) and they have to take extra measures not to be flooded.
Answer:
The year the Greek city of Helike disappeared is -⅕ times the year the US Civil War ended. Let w represent the year the Civil War ended.
Explanation:
It is in the united states located in new york
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