5th Grade Reading Quiz
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PASSAGE
The International Space Station is a large science lab. People call it the ISS. It circles Earth about 250 miles above the ground. One main idea is that the ISS is built through teamwork. The station has parts from the United States, Russia, Japan, Canada, and some European countries. Astronauts from different countries train together. They share jobs, like fixing gear and running tests. Supplies come up on cargo ships. New crews come every few months.
Another main idea is that the ISS lets scientists study microgravity. Microgravity means very low gravity. Without normal gravity, liquids form floating balls. Flames burn in a new way. Muscles get weak if astronauts do not work out. Researchers test new materials. They study how plants grow. They learn how the body changes in space. These studies help scientists plan longer trips, like a trip to Mars.
Finally, the ISS helps life on Earth. Some research has made better water filters. It has also made better ways to check the air. The station takes photos of Earth. These photos help scientists track storms, wildfires, and ice. Many students talk with astronauts during live events. That can make them want to study science.
Which detail is most important for supporting the main idea that the ISS helps scientists learn in microgravity?
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