Answer:
Worldwide Radio Communication
Explanation:
The ionosphere is important because it is through the ionosphere that world wide radio communication is possible.
C- 10ft. Hope this helped. Have a great day! :D
<span> The
failure of the anchovy harvest in 1972 was blamed on El Niño.</span>
The entire park area is considered to be a semi-arid desert, but distinct habitats are located at different elevations along the 8,000-foot elevation gradient. Near the Colorado River, riparian vegetation and sandy beaches prevail.