History

History, 25.06.2019 13:00, j1theking18

The gypsum hills are how hills capped with layers of a white mineral used to make plasters and cement. a)sandstoneb)gypsumc)chalkd)rhyolit e

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Biology, 28.06.2019 22:00, isabellamason1499

Suppose you are hiking in the hills and you come across a wall of rock. you look closely at the rock and you notice a trilobite fossil embedded in it. what might this fossil suggest yo you about the hills you are hiking in? a. the hills used to be volcanic and are now dormant b. the hills, at one time, were under water c. the hills were once at a much higher elevation d. the hills are rich in sandstone

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What is the main reason that rome was built on hills? a. the hills had fertile farmland. b. the hills provided a natural defense. c. the hills were near a port. d. the hills were densely populated.

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Geography, 23.07.2019 13:20, emma2827

Supposed you are hiking in the hills and you come across a wall of rock you look closely at the rock and you notice a trilobite fossil embedded in it what might this fossil suggest to you about the hills you are hiking in the hills used to be volcanic and are now dormant the hills were once at a munch higher elevation the hills are rich in sandstone the hills, at one time, were under water

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Biology, 23.08.2019 12:00, ijohnh14

Gypsum is a mineral used in the production of cement. the following table describes the properties of the mineral gypsum as well as the properties that make cement useful. properties of gypsum gypsum is a solid at room temperature and is composed of calcium and sulfate bonded to two water molecules. gypsum fractures to make smooth surfaces. gypsum has a low hardness. gypsum can change hydration reaction rates based on concentration. gypsum is typically white, clear, gray, or yellow in color. cement needs to be able to flow into any shape before setting. desired properties of cement cement needs to fracture unevenly to improve durability. cement needs to have a high hardness after setting and drying. cement needs to be able to have different hydration reaction rates to change the setting and drying time for different uses. a neutral color is preferred for cement. which property makes gypsum useful in the production of cement? a. gypsum has a low hardness. b. gypsum is a solid composed of calcium and sulfate bonded to two water molecules. c. gypsum fractures to make smooth surfaces. d. gypsum can change hydration reaction rates based on concentration.

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