Question

Manure contains minerals (such as nitrogen and iron) which plants need. We provide garden
and crop plants with these minerals. Where do plants which grow naturally get these from?
(Hint: Why did you fill the pots with sand and not soil?)​

Answer 1

Plants get these minerals from the sand and not soil because Silica, also known as silicon dioxide, is a natural occurring material that is also the major constituent of sand, which is estimated to comprise more than 10% by mass of the earth's crust while soil is not good for plants to grow !

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