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Impressive-Sort223 t1_j5f4uus wrote

How are we supposed to tell what changed?

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mydriase OP t1_j5f51ae wrote

well ... there are colors ... there is a key to understand the colors. the rest is up to you :)

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Impressive-Sort223 t1_j5f58pk wrote

I understand that there is a key. I see that the green means that there is acidity. How is that significant if I cannot see before it was acidic? This is just the end result. We need to see when it started in 1910 and the end result in 2010.

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mydriase OP t1_j5f5bja wrote

No, -0,2 means it decreased by 0,2 between the two dates

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