Its a timeline that shows the History of Quarks?
The time line or time slider in Google Earth allows you to select different times or animate a time ordered sequence. If placemarks contain time information then the time slider is displayed. Such time information can be used for GPS tracks or a visualization of a flu epidemic showing the spread from region to region. See related links for tutorial using the time slider controls.
Quarks. Up and down quarks, I think. Google quark.
Usually around Thanksgiving time.
Periods
It was the Precambrian time period.
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I think that is a way of showing that a section of the time line with no related events has been removed from that place on the line. A more common way of showing that is with a pair of slashes spanning a break in the line (------//------).
Ask this question again to define what subcontinent you are asking about.
The time line for the history of China can be found in the link provided below.
The time line of the history of biology is the 19th century. that's all I know
Yes.
time is normally the horizontal line
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It is great for showing a unit over time. This is usually a profit from a product.
Line graphs are generally used for this purpose. Bar graphs are also used to show change over time.
Prehistoric time line
you use a broken line graph usually for showing continuous data (data with growth over time)