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nikitadnepr [17]
3 years ago
10

Need Help ASAP

Biology
2 answers:
Marat540 [252]3 years ago
8 0

Some minerals are widespread throughout Earth’s crust, but occur in such low quantities that miming is not economically practical. Examples are Cerium, Copper, Cryolite ore that is mined for the production of Aluminium, are all present in low quantities on the Earth's crust. The extraction of Gold and Platinum from deep within the Earth's crust is also very difficult and the economics is very complicated.

sesenic [268]3 years ago
3 0
The correct answer is pressure
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Water molecules forming hydrogen bonds with one another. The partial negative charge on the O of one molecule can form a hydrogen bond with the partial positive charge on the hydrogens of other molecules. Water molecules are also attracted to other polar molecules and to ions.

Plants obtain the hydrogen they need from water molecules. Don't try to feed your plant hydrogen gas -- your plant wouldn't know what to do with it if you did. As long as they have water, plants can readily obtain all the hydrogen they need. :)

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