It is because time is often, though not always, an independent variable.
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Usually the x-axis of a bar graph shows a control range, and is plotted on the bottom of the graph. Time is a common x-axis example.
Normally, if the graph is scientific, the x axis will be time, and the y will be what you are measuring. however this is not ALWAYS the case, and in all actuality, anything can be on the x and y axis.
No. Generally speaking, a trend graph has time on the horizontal axis. That is not always the case with line graphs.
Data that can be controlled on a bar graph is known as an independent variable and can include things like temperature, time, depth, etc. This data is placed on the horizontal X axis.
It is a line chart which usually starts at the origin, goes up in the first quadrant. It may return to the horizontal axis.