Which of the following is a valid explanation for the existence of a coarse-grai

Question

Which of the following is a valid explanation for the existence of a coarse-grained (phaneritic) igneous rock on the surface of Earth? The coarse-grained rock formed from the accumulation of pieces of other igneous rocks that were weathered and eroded on Earth's surface. The coarse-grained rock formed from slowly cooling magma beneath Earth's surface, but was later uplifted by tectonic forces and exposed by weathering and erosion. The coarse-grained rock formed from re-melting and slow cooling of fine-grained igneous rocks on Earth's surface. The coarse-grained rock formed on Earth's surface from slowly cooling magma. Choose the words on the right that best complete the following sentences. A sedimentary rock containing mostly quartz likely traveled [X] before deposition and lithification than a sedimentary rock containing a relatively large amount of feldspar. Furthermore, a sedimentary rock containing large, angular fragments likely traveled [Y] before deposition and lithification than a sedimentary rock containing smaller, more rounded particles. less distance from its source a greater distance from its source

Explanation / Answer

Question 2:

Felsic Igneous Rocks : B) Formation of igneous rocks of this composition always involves melting of continental crust, such as at continental-continental convergent boundary or within the interiors of continents.

Intermediate Igneous Rocks: C) These igneous rocks often form when both oceanic and continental crust melts, such as at oceanic continental convergent boundaries.

Mafic Igneous Rocks: A) These igneous rocks typically result from the melting of the oceanic crust (such as an oceanic hot spot or oceanic-oceanic convergent boundary) or from partial melting of ultramafic mantle rock.

Question 3:

Correction answer: Option #2. The coarse-grained rock formed from slowly cooling magma beneath Earth's surface, but was later uplifted by tectonic forces and exposed by weathering and erosion.

This is a valid explanation for the existense of a coarse-grained (phaneritic) igneous rock on the surface of the Earth.

Question 4:

X = B) a greater distance from its source.

Explanation: Quartz is much more resistant to erosion, hence the pebbles travel farther before breaking into smaller pieces eventually becoming a deposition.

Y = A) less distance from its source.

Explanation: The farther the rock fragments travel, the more they break into smaller pieces and eventually become rounded, hence angular fragments mean that the rock fragments did not travel very far before lithification.

All the best :)

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