Time and Elevation Number Lines

Elevation (feet)

Elevation (feet)
Elevation is the distance above sea level.

Which number line does this image represent?

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That means it represents which axis?

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What does it mean that the fish is at a negative elevation?

Timeline (years)

Timeline (years)
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Which number line does this image represent?

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That means it represents which axis?

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Why does it make sense to have negative years? What does this mean?

Did year -2000 or -1000 occur first? Explain.

According to the timeline, how many years ago did Greece enter the "Dark Ages" (given that it is currently the year 2016). Explain how you got to your answer.