Read the passage and then choose the best answer to the question. Answer the question on the basis of what is stated or implied in the passage.
When we think of volcanoes, eruptions, lava, and smoke filled air come to mind-all
occurring on land. Most people are surprised to learn about the prevalence of
underwater volcanoes on our planet. Because the lava and smoke spilling out of an
active, underwater volcano is contained by the ocean, people generally do not take
note of these eruptions. However, the largest underwater volcanoes are capable of
creating huge tidal waves, threatening coastal communities.
The main idea of the passage is that
traditional volcanoes and underwater volcanoes are similar
the lava and smoke from an underwater volcano is contained by
the sea