Water is always flowing, from a brook to a stream, to a riverto the ocean. Read and find out more about how water shapes theearth and why it is important to keep our water clean.

Every year like clockwork, animals both big and small aredriven by a natural instinct to move, in order to survive. On bothland and sea, they fight the odds and the forces of nature tobreed, feed, or lead and carry on for future generations. Thisreader is an introduction to the treacherous trek of the zebra,walrus, and Christmas Island red crab to overcome obstacles thatinclude hungry cheetahs, stinging yellow crazy ants, and even theirfellow species to make the often impossible journey of theirlives.

Readand find out about one of nature's most mysterious forces--theearthquake. Some earthquakes are so small that you don't even feelthem, while others can make even big buildings shake Learn whyearthquakes happen, where they are most likely to occur, and whatto do if one happens near you.

Each person in the United States makes almost five pounds oftrash every day. That’s more trash per person per day than peoplemake in any other country! We throw away everything from applecores to bicycles. Sometimes, we even throw away things that couldbe poisonous if they aren’t disposed of properly. And often, wethrow away things we shouldn’t, things we could use again. So, whathappens to all our trash? How does it affect the environment? Andhow can we stop making so much of it? Read and find o

太空狗麦克斯的宇宙探索系列一部 一条罗威纳犬要加入人类全新月球探索任务的队伍！ 一条地球狗迈向月球需要分几步？ 作为一条登月的狗狗，麦克斯和宇航员们又会遇到哪些趣事？ 书里模拟了真实的太空探险，让孩子们在幻想旅行中获取天文宇宙知识，跟着狗狗麦克斯一起发现月球的奥秘！

Holidays Heroes（《美国的纪念日》）系列介绍了美国的纪念日、节日，以及与之相关的历史人物、社会事件等，文字简洁生动，图片丰富多样，适合小学生学习历史，了解美国文化，关注社会进步。免费赠送英语朗读音频，地道的英文表达帮助孩子扩充英语词汇量，提高英语阅读能力。 本册Let sCelebrateLaborDay（《劳动节》）讲的是有关美国劳动节的知识。所有美国人都喜欢庆祝劳动节，这是个周末，游行再加上野餐，非常欢乐。不过，在9月伊始的周一，也别忘了这个节日的真正意义：致敬美国所有的劳动者，尤其是那些为没有危险的工作环境和公平报酬而奋斗的工人们。

Holidays Heroes（《美国的纪念日》）系列介绍了美国的纪念日、节日，以及与之相关的历史人物、社会事件等，文字简洁生动，图片丰富多样，适合小学生学习历史，了解美国文化，关注社会进步。免费赠送英语朗读音频，地道的英文表达帮助孩子扩充英语词汇量，提高英语阅读能力。 本册Let sCelebrateThanksgivingDay（《感恩节》）讲的是有关感恩节的知识。书中用两条平行线的叙述方式，分别讲述了印第安人和美国早期批移民的故事，从移民1620年登陆一直讲到1621年他们分享感恩节大餐。

The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system!The magic tree house has returned and it s taking Jack and Annie back in time to Alaska, 1925. There they meet Balto, a jet-black Siberian husky destined to save victims of the diphtheria epidemic. But the trail isn t easy, and Balto is going to need Jack and Annie s help!Formerly numbered as Magic Tree House #54, the title of this book is now Magic Tree House Merlin Mission #26: Balto of the Blue Dawn.Did you know that there s a Magic Tree House book for every kid?Magic Tree House: Adventures with Jack and Annie, perfect for readers who are just beginning chapter booksMerlin Missions: More challenging adventures for the experienced readerSuper Edition: A longer and more dangerous adventureFact Trackers: Nonfiction companions to your favorite Magic Tree House adventuresHave more fun with Jack and Annie at MagicTreeHouse.com!

太空狗麦克斯的宇宙探索系列第四部 多年之后，麦克斯的孙子——麦克斯二世 即将与人类一同前往充满奥秘的木星探险 人类对木星知之甚少，麦克斯与伙伴们将会看到怎样的木星？ 木星与地球、月球和火星有哪些大不同？ 超远距离的太空旅行又会带给我们哪些新奇体验？ 书里模拟了真实的太空探险，让孩子们在幻想旅行中获取天文宇宙知识，跟着狗狗麦克斯一起发现木星的奥秘！

Holidays Heroes（《美国的纪念日》）系列介绍了美国的纪念日、节日，以及与之相关的历史人物、社会事件等，文字简洁生动，图片丰富多样，适合小学生学习历史，了解美国文化，关注社会进步。免费赠送英语朗读音频，地道的英文表达帮助孩子扩充英语词汇量，提高英语阅读能力。 本册Let sCelebrateColumbusDay（《哥伦布日》）讲的是有关美国哥伦布日的知识。航海家克里斯托弗 哥伦布从小就梦想成为一名水手，他勇气非凡，很有毅力，但有时候也有点贪婪。哥伦布一直在寻找财富，但始终没有找到。不过，他的其他发现可比他所能想象到的重要多了。