十万个为什么·科学阅读30篇（5）

1 Why Do Leaves Change Color in Fall? 秋天树叶为什么会变色？ 2 How Do Bees Make Honey? 蜜蜂是怎么制造蜂蜜的？ 3 Why Is the Sky Blue? 天空为什么是蓝色的？ 4 How Do Volcanoes Erupt? 火山是怎么喷发的？ 5 Why Do We Yawn? 人为什么会打哈欠？ 6 How Do Rainbows Form? 彩虹是怎么形成的？ 7 Why Do Some Animals Hibernate? 为什么有些动物要冬眠？ 8 How Do Magnets Stick to Metal? 磁铁为什么能吸住金属？ 9 Why Do We Have Fingerprints? 人为什么有指纹？ 10 How Do Seeds Travel? 种子是怎么传播的？ 11 Why Do Stars Twinkle? 星星为什么会闪烁？ 12 How Do Ants Carry Heavy Things? 蚂蚁是怎么搬动重物的？ 13 Why Do Some Clouds Produce Rain While Others Do Not? 为什么有些云会下雨，而有些不会？ 14 How Do Plants Drink Water from the Ground? 植物是怎样从地下喝水的？ 15 Why Does Ice Float on Water but Sinks in Alcohol? 为什么冰能浮在水上，却沉在酒精里？ 16 How Do Bats Find Their Way in Total Darkness? 蝙蝠怎样在完全黑暗中找到路？ 17 Why Do We See Mirages on Hot Roads? 为什么炎热路面上会出现海市蜃楼？ 18 How Do Tides Rise and Fall Every Day? 潮汐为什么会每天涨落？ 19 Why Do Some Rocks Glow in the Dark? 为什么有些岩石会在黑暗中发光？ 20 How Do Fireflies Make Their Own Light? 萤火虫是如何自己发光的？ 21 Why Do Deserts Get So Cold at Night? 为什么沙漠夜晚会变得非常冷？ 22 How Do Coral Reefs Grow So Slowly? 珊瑚礁为什么生长得如此缓慢？ 23 Why Do Some Lakes Change Color Seasonally? 为什么有些湖泊会随季节改变颜色？ 24 How Do Geysers Shoot Hot Water Into the Air? 间歇泉是如何把热水喷向空中的？ 25 Why Do Some Trees Lose Leaves in Winter? 为什么有些树在冬天落叶？ 26 How Do Snails Make Their Shiny Trails? 蜗牛是怎么留下闪亮痕迹的？ 27 Why Does Thunder Come After Lightning? 为什么先看到闪电后听到雷声？ 28 How Do Penguins Stay Warm in Icy Water? 企鹅如何在冰冷海水中保持温暖？ 29 Why Do Bubbles Pop So Easily? 为什么泡泡那么容易破？ 30 How Do Bees Know Which Flowers Have Nectar? 蜜蜂怎么知道哪些花有花蜜？