Biology, 08.01.2020 21:31, owoeli

A. the mineral
silicon dioxide sio2, is created by combining the elements silicon and oxygen.
b. coal, from plant materials, and
created by corals and other sea creatures, are not minerals even
though they are mined like many ores.

Answers: 2

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answered: 00109625

a) The mineral Quartz (silicon dioxide SiO2), is created by combining the elements silicon and oxygen.

b) Coal, from plant materials, and limestone (calcium carbonate CaCO3) created by corals and other sea creatures, are not minerals even though they are mined like many ores.

Explanation:

Quartz is a very hard mineral created by combining the elements silicon and oxygen. It is chemically stable and so weathers very slowly. The quartz crystal can be colored yellow, brown, black, milky white, rose, etc depending on the impurities in the rock at the time of formation. It is used in the production of optical instruments, various electrical devices, sandpaper, grinding tools, etc.

Coal is formed from the gradual accumulation of plant remains (peat) that are found in tropical wetlands. It is used as fuel for electric power generation, in blacksmithing purposes and to make coke.

Limestone is made up of skeletal fragments from marine organisms like corals, planktons, coralline algae, sponges, echinoderms, mollusks, foraminifera, etc. The shells of most of these organisms are made up of aragonite or calcite. When they die, the shells left behind are accumulated over millions of years and form limestone. It is used in the production of lime, used as a building material and filler in products like toothpaste or paints. It is also an essential component of Portland cement.

answered: Guest

[content deleted] - user123802726recklesschicken

answered: Guest

Hunting in the darksome fish rely on senses beyond sight. in the darkness of the marianas trench, a fish called the rattail has an extremely sensitive sense of smell. the fish uses scent, rather than sight, to steer toward food. once it's near food, the rattail uses a special organ on the bottom of its chin to guide itself by feel.marine snowone staple of the deep sea diet is "marine snow," flakes of organic, edible substances that sink down from the upper ocean. animals at the ocean's bottom find sustenance in everything from the bodies of dead creatures to fecal matter. marine snow is diverse enough to support numerous species. for instance, several species of snails and worms feed exclusively on deceased whales.microorganismsthe deep sea is an intricate ecosystem, and even the ocean floor itself plays a part. hydrothermal vents are cracks in the sea floor where erupting magma mixes with ocean water to produce plumes of hot, sulfur-rich chemicals. some microbes can use these chemicals for energy, sustaining their existence and that of the animals who depend on their roles in the deep sea food chain.