Large rock particles that are left behind when smaller particles are carried away by wind in desert environments create feature known as a [x] (two words).

    Desert pavement

Explanation:  When wind in dry areas such as the desert takes away small  particles of stone and sand, the surfaces remain known as a dessert pavement. These are tiny remnants of rocks or gravel that are firmly nailed, that is, sandblasted, and thus form pavement-like plateaus. When small parts of rocks and sand are removed by wind, larger parts of rocks and gravel are left, which are trapped by rain, thermal expansion, the passing of animals, etc.

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:

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