Explanation:
Serpentine
- Formation: it forms through serpentinization, a geological low-temperature metamorphic process where low-silica mafic and ultramafic rocks are oxidized and hydrolyzed with water into serpentinite.
- Characteristics: rich in magnesium and water, light to dark green, greasy-looking and slippery feeling. It can resist the transfer of heat. A source of asbestos, architectural stone, ornamental stone, gem material
- Minerals present: it follows the formula (X)2-3(Y)2O5(OH)4 where X can be magnesium, iron, nickel, aluminum, zinc, or manganese; and, Y will be silicon, aluminum, or iron.
Green Schist
- Formation: they form by regional metamorphism of mafic igneous rocks through depth of burial, and proximity to batholiths.
- Characteristics: The green is due to abundant green chlorite
- Minerals present: actinolite and epidote mainly, but they can also include quartz, orthoclase, talc, carbonate minerals, and amphibole.
Basalt Pillow
- Formation: it forms when lava of basaltic compositions erupted underwater. The rapid cooling of the lava forms the pillow-shaped bodies.
- Characteristics: they are volcanic igneous rocks, very dark, almost black color.
- Minerals present: Basalt has a lower percentage of silica and a higher percentage of iron and magnesium than other volcanic rocks.
Umber
- Formation: it develops in Cyprus massive sulfide deposits.
- Characteristics: is not one precise color, but a range of different colors, from medium to dark, from yellowish to reddish to grayish depending on the iron oxide and manganese in the clay
- Minerals present: contains iron oxide and manganese oxide and sulfide precipitates like pyrite.
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Ocean ridge does not accompany volcanic activity in the Pacific Northwest.
<u>Explanation:</u>
In this process the denser oceanic plate force the thinner continental plate to sink into the mantle. This region is referred as subduction zone, where it results in intense volcanic eruptions and earthquakes.
The denser Pacific plate sinks because of the chunk pull impact and it likewise prompts the development of mountains. This sort of impact creates profound center seismic tremors.
It isn't related with the maritime edge as the mid-maritime edge shapes in a disparate plate limit. In the Pacific Northwest , the volcanic activity is carried out by the geological process majorly by subduction.
Answer:
Core.
Explanation:
The core is magnetic and is the cause of the Poles and the magnetosphere.
The Aral Sea has shrunk in size because of heavy irrigation. The correct option among all the options that are given in the question is the third option or option "C". The Soviets used the river waters feeding the Aral sea for the purpose of cotton plantation and this destroyed the Aral Sea.
