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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I believe it is D, The house (was painted) that summer. Hope this helped!
Answer:
Protein Is Important for Bone Health
Explanation:
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Annotating is a very important thing to do and it helps you remember ideas that you had read about later on
Answer:
Variable expense
Explanation:
the milk becomes a variable expense because it doesn't have a fixed amount. it could be 2 or 3 or 4 or 1 depending on the number of persons having breakfast everyday over the course of the week but not 5.
if 5 milks are purchased day-in, day-out, the milk would be afixed expense but that isnt the case here.
the term variable expense ffrom the name means an expense that changes or varies from time to time
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