Volcanoes swell when A. air builds up inside it. ...

[ Vocabulary ]

Volcanoes swell when

A. air builds up inside it.

B. there is too much rain.

C. magma pushes up inside it.

D. lava shoots out and falls back inside it.

Select your answer:

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Noun, Verb, Adjective Present & Past Tenses Linking Verbs & Helping Verbs Grammar: Have to Passive Voice in Past and Present Tense -ed or -ing Demonstrative Pronouns Gerunds/Infinitives Present Simple & Present Progressive Tense

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