1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
grin007 [14]
3 years ago
12

Which of the following would be an important observation that could help you identify a metamorphic rock? Choose one: A. large c

rystal size B. sand grains that break along grain boundaries C. the presence of calcite D. the arrangement of mineral grains into a foliation
Geography
1 answer:
raketka [301]3 years ago
3 0

Answer:

D. the arrangement of mineral grains into a foliation

Explanation:

Due to the tectonic activity of the terrestrial lithosphere, igneous and sedimentary rocks formed in certain environments and under precise environmental conditions, can be subjected to new conditions (essentially pressure and temperature). Under the new conditions, and frequently under the action of tectonic stresses (linked, for example, to the formation of mountain ranges), pre-existing rocks are transformed texturally, structurally and mineralogically into a solid state, giving rise to metamorphic rocks. Its fundamental characteristic is to present blastic texture (i.e., solid state recrystallization), and in cases of deformation, anisotropic factories.

The petrographic characteristics of these rocks are especially complicated, given the solid state transformation processes that they have suffered, usually accompanied by intense deformation. Due to the gradual nature of metamorphic (and deformational) transformations, the characteristics of this type of rock also range from igneous or sedimentary to purely metamorphic.

<u>Foliation </u>

The term foliation (foliatus: leaf-shaped) refers to any planar (almost flat) arrangement of mineral grains or structural features of the interior of a rock. Although there is foliation in some sedimentary rocks and even in a few types of igneous rocks, it is a fundamental characteristic of rocks that have undergone regional metamorphism, that is, rocky units that have folded and deformed greatly. In metamorphic environments, foliation is caused, ultimately, by the compressive efforts that shorten the rock masses, causing the mineral grains of pre-existing rocks to develop parallel or almost parallel alignments. Examples of foliation are the parallel alignment of minerals with planar habit and / or elongated minerals; the parallel alignment of mineral particles and flattened edges; the compositional bandeado where the separation of dark and light minerals generates a laminar appearance, and the blackboard when the rocks easily separate into thin and tabular layers along parallel surfaces. These different types of foliation can be formed in many different ways, such as:

1. Rotation of elongated or planar mineral grains towards a new orientation.

2. Recrystallization of minerals to form new grains that grow in the direction of the preferred orientation.

3. Changes in shape in equidimensional grains to elongated shapes that align in a preferred orientation.

You might be interested in
"Weather" and "climate" are ________. A) synonyms B) differentiated because climate studies the stratosphere C) differentiated b
Brut [27]

Answer: C: differentiated because climate studies the long-term patterns over time

Explanation: Weather is just what you see outside, like sunny, clear, or rainy. Climate is a region’s constant weather PATTERN like for example, Alaska is frigid and icy while Florida is humid and tropical.

7 0
2 years ago
During the french and Indian war France and Great Britain fought for control of north America territory what impact did the end
artcher [175]

In the short-term, The French-Indian War or The Seven Years War expanded the British colonial territory in North America by an enormous amount and removed potential competitors in early westward expansion. In the long-term, it resulted in extreme national debt in Britain, bringing about dictatorial control of its colonies so it could alleviate economic stress. First came the passing of the Proclamation of 1763, which stopped all westward movement by its American colonies past the Appalachian Mountains (they hoped to make Native Americans and the Spanish buy land), then several new Acts like the Stamp Act were passed which taxed goods like paper, and eventually, as some historians interpret, led to the American Revolution.

5 0
3 years ago
What landform regions are on Canada
Novosadov [1.4K]

Answer: Canada may be divided into seven physiographic regions: Arctic Lands, Cordillera, Interior Plains, Hudson Bay Lowland, Canadian Shield Forest Lands, St Lawrence Lowlands and Appalachia. Divisions are based on each area's relatively similar physical geography and landforms.

Explanation:

6 0
3 years ago
Read 2 more answers
What is the country that is made up of thousands of islands near the equator?
tekilochka [14]
A. Indonesia.

 the Federated States of Micronesia and the Indonesia (both of which consist of thousands of islands). Others consist of a single island, such as Nauru, or part of an island, such as Haiti. 
8 0
3 years ago
Large flowing water that goes across land and ends up at the sea
Ede4ka [16]

Answer:

A channel

Explanation:

6 0
3 years ago
Other questions:
  • What is the difference between Typhoon and hurricane
    12·1 answer
  • If the mirror is 34 feet from the cliff side determine the height of the cliff
    13·1 answer
  • Wich american started a settlement in texas in the early 1820s?
    5·1 answer
  • Which two parts of the Earth make up the lithosphere?
    14·2 answers
  • What country connects Central America to South America? what is its capital?
    8·2 answers
  • Explain the role of scientific investigation in the development of the Theory of Adaptation.
    8·1 answer
  • Mention five benefits of geography​
    12·1 answer
  • Which of the following is not information you would find on a topographical map?
    10·1 answer
  • Which of the following is the most important factor when determining a safe speed?
    5·1 answer
  • Hi, who is washington.
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!