Trayectoria de choque: Los asteroides y la Tierra (Collision Course: Asteroids and Earth)

¿Crees que los fantasmas existen? ¡Viaja al este de Estados Unidos y deci ́delo tu ́! Recorre el campo de batalla de Gettysburg, visita la histo ́rica Casa Blanca y pase ́ate por la casa de Lizzie Borden. ¡Te espera una aventura espeluznante!

The world is filled with curious objects made by plants, animals, and even by the Earth itself. Dive into this collection of more than 100 intriguing items from the natural world and discover the stories behind them. Learn how huge whales eat tiny animals from looking at their bristly teeth, why butterflies shine and glitter in the sunlight from seeing their minute wing scales, how plants transport water and food around from examining a delicate leaf skeleton, and what makes every snowflake unique from admiring their miniature, branching crystals of ice. Birds' eggs, a lump of coal, a glass...

In an online world where the amount of information seems to increase exponentially even week to week, student researchers can find it an ever-greater challenge to distinguish credible, vetted content from hearsay and misinformation. This book on citing internet sources will help them determine which online sources are trustworthy and which are not. Its lively and engaging instructional tips will help readers successfully negotiate the vast landscape of information out there. They will produce quality research for papers now and beyond in their academic careers with skill and confidence.

Can you identify construction vehicles? Do you know what a harvester does in a wheat field? Discover the trucks and machines in this little book that will excite kids of all ages.