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학년 · 단어 28개 · 표현 42개 · Q&A 0개
초등영어 리딩이 된다 Basic 4
단어28 words
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honeycomb
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hexagon
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-sided
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polygon
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room
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gap
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weak
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store
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stronger
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fill
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lightning
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thunder
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second
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fireworks
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rainy
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flash
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slowly
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learn
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far
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government
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warning
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message
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satellite
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photo
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example
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send
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land
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helpful
문장42 expressions
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right away
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in detail
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We get honey from honeycombs.
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A honeycomb has many rooms.
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The rooms are hexagons.
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A hexagon is a six-sided polygon.
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Why do bees use hexagons?
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At first, bees make circles.
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But there are gaps between the circles.
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The honeycomb can become weak.
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They need to store a lot of honey.
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So they need to make stronger rooms.
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Bees fill the gaps between the circles.
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Later the circles become hexagons.
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Hexagons make a strong honeycomb for bees!
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Light travels very fast.
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Then is it faster than sound?
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Think about a rainy day.
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Lightning flashes.
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And we see it right away.
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But we hear thunder later.
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Because sound travels more slowly than light.
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Count the time between lightning and thunder.
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We can learn how far away they are.
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Is it five seconds?
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Then they are about 1,700 meters away from us.
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Because sound can travel about 340 meters in a second.
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Count the time between fireworks and their sounds.
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Is it three seconds?
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Then how far away are they?
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We use technology every day.
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Technology even helps us during and after earthquakes!
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How? Here are some examples.
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The government sends warning messages.
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We see the messages right after an earthquake.
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The messages have information about the earthquake.
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They help us prepare for aftershocks.
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The government also uses satellite photos.
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The photos show the land in detail.
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We can see safe places in the photos.
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So they help us find safe places after an earthquake.
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See? Technology is very helpful!
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