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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Being selfish can get you trouble
The first article is about the promotion of a lady from Seattle to an important position at a private company. The fact that the article begins by the sentence “the news is out!” implies up front that it is an important event for its readers and that apparently this lady is an influential and respected member of the community and that this promotion is beneficial for it and for the lady herself.
The second article is obviously a news report on a police investigation. It starts with the mention of “two witnesses”, implying that they were witnesses to a crime, which is confirmed immediately after the opening line. The crime itself has a name (Grand Forks robbery) which demonstrates that the crime was a serious and had dramatic repercussions for the community where it occurred. Even the police official who is interviewed by the press holds an important rank which further underscores the gravity of the offense.
