Are there any environmental concerns with the use of Helium?

Yes

Explanation:Helium is described as truly inert, because it does not form stable compounds with other substances under any conditions. ... Helium is a natural, inert gas. Most helium is found in natural gas fields. We can extract helium from rich natural gas fields and use it safely without harming the environment. i hope this helped you~! <\3

7. which was not an important advance made by the maya:

-deviced and accurate map of the world.

8. what was justinian code:

-a single, consistent set of laws for the byzantine empire.

9. which describes what theodora achieved as justinian´s most trusted adviser:

-getting laws passed to give married women more rights and to protect divorced women.

10. what caused the christian church to divide into two branches- the eastern orthodox church and the catholic church:                                             -differences in language, liturgy, and views on religious icons.

11. what was a result of the work done by the monks cyril and methodius:       - orthodox christianity spread to slavic cultures.

12. which is true about byzantine culture:

-it was a blend of greco-roman and persian culture.

13. which was not a major accomplishment of byzantine culture:

-the reconstruction of moscow

14. which group invaded the slavic homeland beginning in the ninth century:

-varangians

15. what did vladimir, prince of kiev, do in 988 to unify his people:       - he converted to orthodox christianity

16. what is the name of the book in which muhammad ´s words and teaching were collected:

-quran

17. what is the hajj:

-the pilgrimage to mecca that all muslims must undertake if possible

18. which accurately describes islamic belief:

-muhammad is god´s only prophet.

19. what happened to islam after the death of muhammad:

-it was practiced by only few people in small parts of the world

20. which region shows the extent of islamic territory 100 years after muhhamed´s death:

-egypt, mesopotamia, persia.(b)

21. which led to the division between sunni and shia following the death of muhammed:

-conflict over who should be the caliph

22. the muslims achieved many spectacular advances, which was not one of them:

-they created the justinian´s code.