I’m pretty sure it’s bulb but not 100% sure :)
Block Mountains are tourist attractions.
Block Mountains with ice on top are sources of rivers when ice melt and these provide water for irrigation, transport and industrial development.
Block Mountains modify climate through influencing the formation of orographic rainfall.
Some Block Mountains contain minerals thus lead to the development of the mining industry for example former copper extraction from the Rwenzori Mountains and the current cobalt extraction.
Rivers originating from Block Mountains form waterfalls from which hydro electric power is generated thus helpful for industrial development.
Answer:
Photosynthetic organisms was the reason of these atmospheric changes.
Explanation:
The plant which is discovered by the scientists that is apparently devoid of life but has ice caps located at the poles which reveals that planet's atmospheric O₂ levels sharply increased about 1,000,000 years ago was due to evolution of photosynthetic organisms like cyanobacteria etc which went extinct and then O₂ levels dropped quickly 50,000 years ago. So photosynthetic organisms was the reason of these atmospheric changes.
