# science-hydrophonics

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the advantage of gravel is :
the disadvantage of gravel:

the advantage of sand
the disadvantage of sand

• science-hydroponics -

Here's a website that discusses using sand and gravel in hydroponics.

http://www.frogchorusfarm.com/growingmediagravelsand.html

However, I'm sure it will be easier for you to find these answers in your science book.

• science-hydrophonics -

our teacher took our books

• science-hydrophonics -

weight is a strong disadvantage to both
sand disadvantage is it stays wet
advantage of gravel: air gets to root hairs.

For my orchids, I have found expanded clay particles are superb. I add 1/2 expanded clay, 1/2 shredded rubber tires.

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