Answer:
concrete
Explanation:
Researchers think regolith on Mars could serve as a replacement for concrete components. The Mars rovers have used gas chromatography, mass spectrometry, and laser spectrometry to determine the composition of martian soil. Mars regolith is mostly silicon dioxide and ferric oxide, with a fair amount of aluminum oxide, calcium oxide, and sulfur oxide. The composition varies from place to place on the planet’s surface because of variability in asteroid collisions and the weathering by wind and water, in ancient oceans and in some modern water flows. But no spacecraft has returned to Earth with actual samples of the material.
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<span>Melville’s description of Ahab’s scar in this excerpt from ''Moby ick'' best develops the theme of: the ruling of man's present by his past wounds. This excerpt clearly shows that the scar that character attained in the past still has an influence on his life. The character feels the presence of the scar as if it was freshly got, and all this descriptive language stands as a metaphor of symbolic meaning of people's scars in their life and fate.<span>
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