b. heat
c.extreme pressure
d. weathering
The option B is correct.
The primary agent of contact metamorphism is heat.
Further Explanation:
Contact Metamorphism:When magma is injected towards the surrounding rock, the changes that take place are referred as Contact Metamorphism.
The greater changes take place when the magma touches rock because the temperatures roses as the distance between the boundary and the magma decreases and reaches the highest when it touches the rock or the boundary. The igneous rocks that are formed around from the cooling of the magma arereferred as a metamorphosed zone or a contact metamorphism aureole.The change that occurs is due to chemically active fluids, heat and pressure.
The ore minerals are formed by the process of metasomatism near or at the contact zone. The aureoles show different degrees of metamorphism spreading from the contact area to metamorphosed rock.Therefore,the primary agent of contact metamorphism is heat.
Therefore, the option B is correct.
Learn more:
Answer details:
Grade: High School
Subject: Geology
Chapter: Landforms
Keywords:The primary agent of contact metamorphism is, flowing water, heat, extreme pressure, weathering, metasomatism, igneous rocks, magma
The primary agent of contact metamorphism is:
(B) Heat
Contact metamorphic rocks are formed due to the influence of magma intrusion at very high temperatures. The temperature is very high because it is located close to the magma. The word metamorphic was taken from the Greek words meta and morph. Meta means change, and morph means form. So, we can conclude that metamorphism is the process of changing rock form.
The primary agent of contact metamorphism is the heat. High temperatures come from magmas injected in the surrounding solid rock. Marble is one of the examples of contact metamorphic process. It is created from limestone that has been subjected to heat.
Besides the contact metamorphism, there are two other processes such as dynamo metamorphism, and pneumatolytic metamorphism. Dynamo metamorphism is influenced by high pressure, but pneumatolytic metamorphism is influenced by gases and chemicals.
Subject: Geography
Chapter: The Dynamics of the Lithosphere and Its Impact on Life
Keywords: metamorphic rocks, marble, metamorphic rock factors, the primary agent of metamorphic, examples of metamorphic rocks
Answer:
Prime meridian
Explanation:
trace fossil.
petrified fossil.
cast.
Answer:
d. none of the above
Explanation:
The desert is a very frequent bioclimatic landscape on the earth's surface, characterized by its very low rainfall and low presence of fauna and flora, given the low humidity levels. Although the traditional image of the sandy desert refers to warm and equatorial climates, the truth is that they also count as deserts those located on the Arctic plateau or in the tundra.
The deserts are the product of different erosion processes, such as wind (given its high presence of winds that even form sandstorms) or the impact of solar radiation. The degree of intensity of these factors will depend on many desert characteristics, such as the type of sand formed or the nature of the soil.
Desert vegetation is, in principle, scarce, given the very low humidity margins. The one that exists has adapted to resist such adverse conditions, and it is usually xerophilous vegetation, with a predominance of spiny and resistant plants, such as the cactus, as well as weeds and, at best, small shrubs height.
Contrary to what is thought, there is a well-defined but very scarce desert ecosystem, although adapted to such an adverse environment and focused on the preservation of body moisture. Perhaps this is why reptiles (such as snakes), insects (ants, beetles) and arachnids (scorpions, spiders) abound.
Revealed by erosion and protected from moisture, in the deserts there are numerous mineral resources, such as oil basins (especially in the Middle East) or heavy metals.
Desert sand, also, is usually rich in calcareous elements and salts, so salt is often found in desert areas, such as in the Uyuni region of Bolivia. This type of desert drains the humidity of the environment even more, thus feeding back its aridity.