Please add the options of the question
<span>Sand dunes can encroach on human habitats. Sand dunes move through a few different means, all of them assisted by wind. One way that dunes can move is through saltation, where sand particles skip along the ground like a rock thrown across a pond might skip across the water's surface. When these skipping particles land, they may knock into other particles and cause them to skip as well. With slightly stronger winds, particles collide in mid-air, causing sheet flows. In a major dust storm, dunes may move tens of meters through such sheet flows. And like snow, sand avalanches, falling down the steep slopes of the dunes that face away from the winds, also moving the dunes forward.
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Answer:
1) Hughes invented Hughes Aircraft in 1932 which helped form many ideas and inventions in aerospace tech.
2) Hughes drill bit was named "Rock Eater" because it penetrated medium and hard work with 10 times more speed then any former bit.
3) (I don't know if were still talking about the drill bit or what but here's my answer for that) "Rock Eater" found virtually all the oil discovered in the glory days of wildcatting, making Howard the richest man in the world at the time.
4) "Rock Eater" penetrated 14 feet of hard rock in 11 hours which no previous equipment had been able to penetrate.
5) It greatly effected the oil industry and the Hughes Tool Company.
Explanation:
(Really hope this helps!! Sorry if any of these are incorrect, if they are I am very very sorry! Have a lovely day by the way! <3)
Generally speaking, after <span>world war 2 many Americans shifted to "white collar work," since the need for large-scale factory production had largely diminished. </span>
