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isometric vs. axonometric
A cross‐sectional view portrays a cut‐away portion of the structure/building in question and is another way to show components of the structure which are otherwise not visible from its front view (facade)
i think it has to do with the colour of most soil types being reddish brown hues and soil is primarily involved in crop production & harvest. also, some tree leaves change colour from green to brown during fall season.
Please watch this webinar about the NATA 2021 Change in Pattern. Lots of content is going to be uploaded on DQ Edge and will be discussed over the next few weeks.
In the Description of the YouTube link, there are more links which you can refer to.
Hope this helps.