Read this excerpt from "Types of Volcanoes."

Volcanoes are structures formed around openings (vents) in the ground where molten lava, ash, or gas escape from inside the Earth. We have all heard of lava, but not everyone knows how it forms. Deep inside the Earth, rock that melted long ago beneath the Earth’s crust forms magma, a very hot liquid that mixes with dissolved gases and crystals.

How does the author show that he is writing for readers who are not experts on volcanoes?

He uses terms such as "ash," "crystals," "molten," and "magma."
He writes about differences between what happens to the ground and what happens under it.
He uses terms such as vents and dissolved gases and crystals.
He says that the readers have all heard of lava, but not everyone knows where it comes from.

The author's excerpt type of volcanoes tries to say that readers have heard about the lava but they don't know its source. Hence option D is correct.

What are the types of volcanoes?

The volcano is an opening inside the earth that is connected to the mange chambers buried deep indie the earth and they are presented by various types such as explosive, shield, and composite.

The volcanos are hence a natural disaster as the author tells the readers that they bring ash and magma deep from the earth.

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