Answer:
Explanation:
Địa hình, khí hậu, sông ngòi, sự hình thành các trung tâm công nghiệp lớn, đô thị hóa
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Earthquakes are typically prompted when rock underground suddenly breaks alongside a fault. This sudden launch of energy causes the seismic waves that make the ground shake. When two blocks of rock or two plates are rubbing in opposition to each other, they stick a little. They don't simply slide smoothly; the rocks seize on each other. The rocks are nevertheless pushing towards each other, however now not moving. After a while, the rocks spoil because of all the stress that is built up. When the rocks break, the earthquake occurs. During the earthquake and afterward, the plates or blocks of rock start moving, and they proceed to go till they get caught again. The spot underground the place the rock breaks is known as the focal point of the earthquake. The area proper above the center of attention (on pinnacle of the ground) is called the epicenter of the earthquake.
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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The answer to your question is,
Two. The twin towers both collapsed.
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