Read this excerpt from Exploring the Titanic.

In 1979, off Baja California, we made the most spectacular discovery of all – the amazing black smokers. These underwater vents belch out fluids hot enough to melt lead, and shoot them straight up from the ocean floor through chimneys of lava.

What are black smokers?

A black smoker is a kind of hydrothermal vent that can be found on the ocean floor. It is a crack in the planet's surface from which geothermally heated water comes out. Hydrothermal vents are commonly found near volcanically active places, areas where tectonic plates are moving apart, ocean basins, and hotspots

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Explanation:

thousands of people

explanation:

from the political point of view it could be said that the candidate   is an effective speaker because she takes a strong position on the issue. it is an open discussion but probably she is making a presentation and can choose which subjects she wants to address. she is very likely to attain her aim which is to convince voters to accept her proposal.