Why do lessons about rocks always begin with igneous rocks?

Geography

2 answers:

bonufazy [111]3 years ago

8 0

Because its one of the 3 classifications of rocks. (igneous, metamorphic, and sedimentary rock.)

polet [3.4K]3 years ago

3 0

Answer:

The reason that rock lessons begin with igneous rocks is because igneous rocks were the first to form directly from the earth's magma.

Recall that all existing rocks on Earth were formed for the first time with materials that were already in it, since no new matter is created on our planet.

This is the case of igneous rocks.

These types of rocks were formed thanks to the hot magma that existed on the planet, and that as it goes out towards the surface it cools. When this happens, the materials and minerals found in this rock are formed and thus create what we know igneous rock.

These can be formed on the surface of the earth (extrusive rocks) or below the surface (intrusive rocks).

The rock cycle begins with igneous rocks, since, for example, we would not be able to analyze sedimentary rocks (which are rocks that, through a long process, destroy and re-form other rocks) without first existing such rock.

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Identify the true statement. Choose one: A. The angle of repose is the steepest angle at which unconsolidated sediments can sit

Margarita [4]

Answer:

A. The angle of repose is the steepest angle at which unconsolidated sediments can sit without slipping downhill

Explanation:

The angle of repose is the steepest angle at which unconsolidated sediment can be piled without sliding downward. The angle is also known as critical angle . At this angle the unconsolidated sediments are at the verge of slumping . The angle between the surface of the piled sediments and the horizontal surface is the angle of the repose. At this angle the unconsolidated sediments have reached it limit of accommodating more materials unless it will slump downward.

The make up of the unconsolidated sediments can affect the angle of repose as rounded and fined gained rocks cannot be piled as rough texture d rock materials. The angle of repose can also be affected by the amount of solvents in the sediment. Various rocks sediments possess different angle of repose. Same sediment material can possess different angle of repose if the water contents varies .Example, the angle of repose for sand varies depending on the water contents. The true statement is option A.

The picture above illustrate the angle of repose.