Question

Do some online research about the formation of intrusive and extrusive rocks. Based on your observations of the appearance of phonolite and basalt in part D, which is an intrusive rock, and which is an extrusive rock? Explain your reasoning.

Answer 1

Extrusive rocks are formed on the surface of the Earth from lava, which is magma that has emerged from underground. Intrusive rocks are formed from magma that cools and solidifies within the crust of the planet. ... If lava cools almost instantly, the rocks that form are glassy with no individual crystals, like obsidian.

Step-by-step explanation:

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Answer 2

The key difference between intrusive and extrusive rocks is that the intrusive rocks are formed from magma whereas the extrusive rocks are formed from lava. Before discussing further differences between both rocks, let us see what a rock is and what are intrusive rocks and extrusive rocks. Most of the earth’s surface is covered with rocks of various types. These rocks are formed because of the action of high pressure, high temperatures, and water. Rocks containing different mineral compounds are classified into three major types of namely igneous rocks, sedimentary rocks, and metamorphic rocks.

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