How do organic farming practices relate to soil health?
a.
organic farmers rely on soil health for good crop production.
b.
organic farmers rely on the interaction between soil microbes and organic matter.
c.
organic farmers avoid the use of pesticides and chemicals.
d.
all of the above

The difference(s) between the grand canyon and valles marineris is/are: (a) the grand canyon was formed by water, but valles marineris was not. (a) valles marineris is much longer than the grand canyon. (c) valles marineris is much wider than the grand canyon. (d) valles marineris has large volcanoes near it. all of the above

The mantle is made up of which structural zones?

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