How do igneous rocks melt?

Answer 1

They are melted by lava on the surface or magma in the crust.

Main Idea: Igneous rocks are formed when magma erupts from a volcano and hardens on the surface in the form of lava.

Extrusive (on the surface of the volcano) igneous rocks can be in the form of:
-lava flows
-ash

Intrusive (in the crust of the volcano) rocks can be in the form of:
-batholiths
-crystals
-dykes
-sills
-laccoliths

Sources:
Magmas and Igneous Rock
The Rock Cycle
Melting and Cooling
Igneous Rocks

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Answer 2

Igneous rocks melt due to an increase in temperature that surpasses their melting point. This increase in temperature can be caused by the heat from the Earth's mantle, volcanic activity, or contact with molten rock. When the rocks reach their melting point, the mineral crystals within them break down and melt, forming molten rock or magma.

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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.

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.

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.

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.

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