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ehidna [41]
2 years ago
4

A porphyritic texture where large crystals are embedded in a matrix of small crystal may form when ________.A. climate change ca

uses crystals to cool at different ratesB. crystals of different compositions cool at different ratesC. crystals of different compositions grow to different sizesD. a magma that has partially crystallized slowly moves to a different location where it then cools rapidly.
Geography
1 answer:
Julli [10]2 years ago
8 0

Answer:

D.a magma that has partially crystallized slowly moves to a different location where it then cools rapidly.

Explanation:

<u>Porphyritic texture - </u>

It is specifically formed on the igneous rocks , for the rock which has some difference between crystal size , where one group of crystal is larger than the other group .

Porphyry is one the main type of rock which have porphyritic texture .

<u>Formation of the Porphyritic rocks - </u>

These types of rocks are formed when the rising magma is cooled via two stages , in the stage one , the cooling process is done slowly deep in the crust and forming large crystal grains .

In the step two , the cooling is done rapidly , at shallow depth

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According to the principle of self-determination, what is the only legitimate basis for the formation of a state? A. the nation
Lena [83]

The only legitimate basis for the formation of a state is the nation.

Explanation:

The formation of a state can be an easy or a very complicated process. Also, it can be done in a peaceful manner, or through usage of violence and military action. The states have been formed in many different ways over the course of the history. The principle of self-determination though states that the only legitimate basis for the formation of a state is the nation.

  • This principle seems good and legit, but in practice has turned out to be very problematic.
  • Numerous states have been formed without really having a nation, but more a mixture of different people and cultures stuffed together without even asking them for it.
  • There a re lot of nations around the world that do not have states, or rather are not allowed to have states, such as the Basques, Catalans, Kurdish etc.
  • Some states have been formed because of the interest of other states, like the example of Kosovo in the Balkans.

Learn more about state and nation  https://brainly.in/question/2187717 #learnwithBrainly

3 0
2 years ago
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1) Convert the distance from kilometers into miles.
stealth61 [152]

Answer:

1384.83 miles .

Explanation:

1 .

Conversion of kilometer to mile ,

1 kilometer is equal to 0.621 mile ,

The lower mantle is 2230 km can be converted to miles , by simply multiplying by the value 0.621 .

Hence ,

the conversion is done as follows ,

2 .

Lower mantle = 2230 km = 2230 * 0.621 = 1384.83 miles

hence , the value of lower mantle is 2230 km and in terms of mile is equal to 1384.83 miles .

4 0
2 years ago
A high gradient in air temperature and pressure can cause a jet stream, characterized by high-speed winds. Through which marked
solong [7]

Answer:D -it causes high-pressure air mASses to rotate clockwise

Explanation:

Jet stream is a very fast air stream that occurs in the upper troposphere. Jet streams occur around the earth surrounding it and following an undulating course. These air jets were discovered during the air raids in World War II.

Occurring in the upper levels of the troposphere, this current is of great importance to aviation and can be harnessed to provide fuel economy to the aircraft that penetrate them by taking advantage of the momentum provided by their intense winds. There are two types of jet stream: the subtropical jet, with higher altitude being found between latitudes of 20 ° and 30 °; and the lower altitude polar jet, being generally located between the circumpolar region and the average latitudes (40 ° -70 °). Regardless of the type, jet streams form a boundary between a cold air mass and a hot air mass.

<h2>Hope this helps have a nice day ❤️</h2>

8 0
2 years ago
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Which statement describes the process of subduction?
Harlamova29_29 [7]

<u>Answer:</u>

<em>The geological process taking place in the convergent boundaries is what is called subduction. </em>

<em></em>

<u>Explanation:</u>

The tectonic plates moves from side to another and they are forced to sink because of substantial gravitational forces to the mantle.  

The crust of the earth is continuous however it is divided into pieces, the pieces, therefore, is one called tectonic plates, and they move close to each other through the power of convection cycles contained in the mantle below the crust enabling the plates to move freely.

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