6. High mountain peaks

The perspectives are definitely very wide and extend far into the new millennium. It will be necessary to distinguish the daring and visionary from the utopian and illusory On the other hand, we may feel as if we are progressing in a countryside of high mountains the peaks, the goals are visible and identifiable or may become so as progress is made, but we do not yet know how to reach them. We may find landslides, rockfalls, deep crevices, tumultuous streams along the way, we may have to... 

It is common practice to locate microwave receivers and transmitters atop high buildings when hilltops or mountain peaks are not available. The higher the antennas are raised, the further will be the distance to the radio horizon. It takes many ground-based relay hops to carry a microwave signal across a continent. Since the 1960s the United States has been spanned by a network of microwave relay stations. 

Explain why or why not plan (b) is reasonable. The terrain is mountainous and entirely covered by clouds to an elevation greater than 6000 m, with many mountain peaks as high as 3000 m above sea level. (Collec-... 

Sherpa and Balti porters are acclimatized to high elevations such as those around the K2 mountain peak in Pakistan. 

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