Civil Engineering - Building Materials - Discussion

Igneous rocks are formed due to the solidification of molten magma laying below or above the earth's surface.

Extrusive igneous rocks:these rocks are formed due to the solidification of molten magma laying on the surface of earth eg basalt.

Intrusive igneous rocks. Rocks formed due to solidification of molten magma inside the crust.

1. Plutonic igneous rocks: rocks formed at considerable depth e.g granite.
2 Hypabyssal igneous rocks: rocks formed at moderate depth e.g dolerite.

A is the correct answer.

Igneous rocks: the result of solidification of molten mass(magma) laying below or above the earth surface.

Igneous rocks are classified as,

I) Plutonic -cooling of magma at a considerable depth from earth's surface.
II) Hypabyssal - cooling of magma at shallow depth from earth's surface.
III) Valcanic- cooling of magma at the surface of the earth.

Plutonic rocks are formed by the cooling of magma at considerable depths from the earth's surface. These rocks are also known as intrusive rocks because they intrude into the existing rock formations. Plutonic rocks are different from volcanic rocks, which are formed due to the cooling of lava on the earth's surface.

The rocks made from the cooling and solidifying of molten rock (magma) are called igneous rocks and the two categories of igneous rocks - are volcanic and plutonic rocks.

Volcanic rocks are found on the earth's surface whereas plutonic rocks are found at a considerable depth from the earth's surface.

Igneous rocks are formed due to cooling and solidification of magma.

Igneous rocks have two types-.

1) Volcanic rocks which are formed on the earth surface.

2) Plutonic rocks which are formed at a considerable depth below the earth surface.

So I think plutonic is the very accurate answer.

Intrusive, or plutonic, igneous rock forms when magma is trapped deep inside the Earth. Intrusive rocks have a coarse-grained texture. Extrusive Igneous Rocks: Extrusive, or volcanic, igneous rock is produced when magma exits and cools above (or very near) the Earth's surface.

The rocks made from the cooling and solidifying of molten rock (magma) are called igneous rocks and the two categories of igneous rocks - volcanic and plutonic rocks. Volcanic rocks found on earth surface whereas plutonic rocks found at considerable depth from earth's surface.

In geology, a pluton is a body of intrusive igneous rock (called a plutonic rock) that is crystallized from magma slowly cooling below the surface of the Earth. Plutons include batholiths, stocks, dikes, sills, laccoliths, lopoliths, and other igneous formations.

In geology, a pluton is a body of intrusive igneous rock (called a plutonic rock) that is crystallized from magma slowly cooling below the surface of the Earth. Plutons include batholiths, stocks, dikes, sills, laccoliths, lopoliths, and other igneous formations.

Igneous rock is formed through the cooling and solidification of magma or lava. Igneous rock may form with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.