Why are igneous rocks called primary rocks?

Answer 1

As igneous rocks are formed from magma and begin the rock cycle, they are called primary rocks.

Igneous rocks are created from the cooling of molten magma/lava. All other rocks are derived from them, which is why you will also find them referred to as parent rocks on occasion.

This image is a pretty good illustration of the rock cycle:

As you can see, it starts with magma #-># igneous rock. From there, all other manner of rocks can be made.

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Answer 2

Benjamin Awad

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.