What does sonar mean (what is it an acronym for?)

Sonar, short for Sound Navigation and Ranging, is helpful for exploring and mapping the ocean because sound waves travel farther in the water than do radar and light waves.

Explanation:

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Sonar, (Sound Navigation and Ranging), technique for detecting and determining the distance and direction of underwater objects by acoustic means.

Explanation:

a-he encouraged islamic schools to introduce greek texts.

d-he invited greek scholars to teach their texts to the locals.

explanation:

the transmission of the greek classics to latin western europe during the middle ages was a key factor in the development of intellectual life in western europe.[1] interest in greek texts and their availability was scarce in the latin west during the earlier middle ages, but as traffic to the east increased so did western scholarship.

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a and b are the correct answer to what your looking fior