If granite is an igneous rock, which of these best explain how it formed?
Hints
a.
Through the transformation of a pre-existing rock.
b.
Slowly from the crystallization of magma.
c.
Neither explanation is correct.
b. Slowly from the crystallization of magma.
b. Slowly from the crystallization of magma.
The correct answer is b. Granite is an igneous rock that forms through the slow crystallization of magma. To understand why this is the correct explanation, let's break down the formation process.
Igneous rocks are formed from the cooling and solidification of molten rock material, known as magma or lava. In the case of granite, it specifically forms from the cooling of magma deep within the Earth's crust.
Here's how you can arrive at the correct answer through logical reasoning:
Option a, "Through the transformation of a pre-existing rock," does not apply to granite. When a pre-existing rock undergoes transformation, it typically results in a metamorphic rock, not an igneous rock like granite.
Option b, "Slowly from the crystallization of magma," aligns with our understanding of how granite forms. Magma slowly cools and solidifies over time, allowing crystals, primarily of quartz and feldspar, to develop. This slow cooling process results in the characteristic coarse texture and distinct mineral composition of granite.
Option c, "Neither explanation is correct," is incorrect because option b accurately describes the formation of granite.
Therefore, the best explanation for how granite formed is through the slow crystallization of magma, which is option b.