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.

Commander mckee checked the dials and switches in the shuttle cockpit and determined that they were functioning normally. he then tested the communications systems that connected his ship with the mission control headquarters. he checked the fuel gauges and saw that there was enough fuel for the months-long trip to saturn. all of the other gauges and meters checked out normal, and the idling engines gave off a strong, reassuring hum. after a final glance around, mckee declared that the shuttle was finally ready for takeoff. he readied the brave astronauts under his command and the ground crew alertly awaiting the launch. the rocket took off and, racing through space, eventually arrived at saturn, where commander mckee and his assistants built the first successful human colony. 126 words, 9.8 flesch, 1180 lexile how could a change in emphasis best develop the events in this passage, making for a more interesting and exciting read?

Although the account is in good standing at this point in time. is this sentence incomplete or complete?

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