[For Lower Elementary Students] Play Right Away! Learn with Fun True-or-False Quizzes

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When closing the cap, you need to twist the screw, and when opening it, you turn it in the opposite direction. How easy it is to open changes depending on the direction of force and the number of turns. By understanding how familiar objects work, you can learn ways to use tools properly and the directions in which forces act.

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Ice is lighter than water and floats on it. When water freezes, the arrangement of its molecules changes and expands slightly, which lowers its density. Thanks to this property, even if the surface of lakes and rivers freezes, the water below does not, allowing living things to survive the winter. It is a very important phenomenon in nature.

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Because the Earth rotates, the sun rises in the east and sets in the west every day. When we see the sunrise, we know a new day has begun. The sun’s light and heat are very important for living things on Earth, providing the energy that helps plants grow and enables us to be active and healthy.

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Penguins are birds, but they cannot fly. Instead, they are good at swimming in the water. Their wings have evolved not for flying, but for swimming. They live by walking on ice and catching fish. It’s an interesting aspect of nature that some birds can fly while others cannot.

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While the roots of many plants are in the soil, some plants have aerial roots that extend into the air. Examples include monstera and mangroves. By learning about the roles and types of roots, we can understand how plants have adapted to absorb water and nutrients.