Question

Tick the correct answer- the rock which is made up of molten magma is?

A)Igneous
B)Sedimentary
C)Metamorphic
D)None of the above

Answer 1

Hint:This is one of those kinds of questions which can be easily guessed by elimination method. An easiest and most effective approach will be to break the terms into their root forms.

Complete answer:
As stated previously, we can easily make out the answer by breaking the words into their basic forms. Here we shall attempt to do the same in every option provided-
>This option is correct because the word ‘igneous’ breaks down into its root form as ‘igni’ which means fire or heat and we very well know which form of rocks is made by solidification of hot matter or more specifically saying ‘hot molten matter’. Examples- Granodiorite, Dacite, rhyolite, etc.
>This is an incorrect choice because when we break sedimentary into its basic form, we get ‘sediment’ which means deposits; thus, sedimentary rocks are those rocks which are formed by the gradual compression and deposition of the sediments. The examples of this kind can be- shale, limestone, sandstone, etc.
>Metamorphic term breaks down into the basic form as ‘metamorphose’ which literally means ‘to change’. Thus, these are the kinds of rocks which change from one form to another or more specifically, they’re formed from a pre-existing rock type. Most suitable examples can be- quartzite, marble, gneiss, etc.
>This option is absolutely incorrect as we’ve already figured out our correct answer; igneous rocks are formed by the solidification of the magma and thus, this can’t be a right choice.

The correct answer is Option A

Additional information
Igneous rocks can be classified into two types:
>Intrusive or plutonic rocks
They are formed when magma cools slightly below the earth's crust and hardens into rocks.Example: Gabbro and granite.

>Extrusive or volcanic rocks
They are formed when molten magma spills over the surface due to volcanic eruptions.Example: Pumice, basalt, or obsidian.

Note:Igneous words mean fire or heat; thus such rocks are formed when molten rock (magma) hardens or solidifies under or above the earth's crust.