HELPPP How does the author show that he is writing for readers

who are not experts on volcanoes?

Read this excerpt from "Types of Volcanoes

Volcanoes are structures formed around openings

(vents) in the ground where molten lava, ash, or gaş

escape from inside the Earth. We have al 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.

O He uses terms such as "ash," "crystals," "molten,"

O He writes about differences between what happens

O He uses terms such as vents and dissolved gases

O He says that the readers have all heard of lava, but

and "'magma."

to the ground and what happens under it

and crystals

not everyone knows where it comes from.