Question

Which is most clearly a topic sentence?
Volcanoes may be scary, but they are the result of simple and very
natural processes. Volcanoes are holes in the Earth's crust where
substances from beneath the surface, such as hot gases and molten
rock, can escape. "You can think of a volcano as a paper cut or a
pimple on the Earth," says volcanologist Roberta Alvarez. They're
usually not a big deal on the scale of the whole planet, but they're a big
deal to us." Sometimes these eruptions can be small and ongoing,
such as the Mt. Kilauea eruption in Hawaii that has been occurring
since 1983. Other times, as was the case with Mt. St. Helens in
Oregon, the eruptions are abrupt and violent. When the lava and ash
emitted from a volcano cool and harden, they gradually form
mountains.

Answer 1

Answer:

Volcanoes may be scary, but they are the result of simple and very natural processes.

Explanation:

The options you were given are the following:

• Volcanoes may be scary, but they are the result of simple and very natural processes.
• "You can think of a volcano as a paper cut or a pimple on the Earth,"
• Sometimes these eruptions can be small and ongoing, such as the Mt. Kilauea eruption in Hawaii that has been occurring since 1983.
• When the lava and ash emitted from a volcano cool and harden, they gradually form mountains.

The topic sentence is the most important sentence of a paragraph. It's usually its first sentence, and it summarizes the information it contains.

The sentence that fulfills the given criteria is the first sentence: Volcanoes may be scary, but they are the result of simple and very natural processes.  The paragraph tells us about volcanoes, about what they are and their significance. The first sentence summarizes this information well, unlike the rest of the options, which contain details.

Answer 2

Answer:

Answer is C

Explanation