Why do particles like meteors and comets glow in the evening sky?

The answer to the question above is "because the friction from the Earth's atmosphere causes them to heat up" which is why particles like meteors and comets glow in the evening sky. There are a lot of debris in the Earth's atmosphere that could create frictions to the particle. These debris are the reason why the particles glow.

The investiture controversy began as a power struggle between pope gregory vii (1072–85) and henry iv, holy roman emperor (1056–1106).[2] a brief but significant struggle over investiture also occurred between henry i of england and pope paschal ii in the years 1103 to 1107, and the issue played a minor role in the struggles between church and state in france, as well.by undercutting the imperial power established by the salian emperors, the controversy led to nearly 50 years of civil war in germany, and the triumph of the great dukes and abbots. imperial power was finally re-established under the hohenstaufen dynasty. historian norman cantor:

Tropical climate is experienced in the nothern countries of south america