A contracorriente

What causes sound? How does sound travel? Sound begins when matter vibrates. Without this vibration sound could not move and nothing would make any noise. Starting with tiny molecules, this book explains the main concepts of sound and furthers understanding through a series of easy-to-do experiments that will appeal to readers of all ages.

Con este increible ATLAS DEL MUNDO, descubre nuestro fascinante planeta! - Mas de 35 mapas actualizados a todo color con las fronteras politicas, los paises y las ciudades, y fantasticos paisajes de satelite. - Los capitulos sobre los continentes incluyen informacion sobre el clima, la poblacion, la vegetacion, lugares destacados y mucho mas. - Con una introduccion sobre la Tierra y el mundo moderno. - Informacion clara, curiosidades, fotos a color, asi si que es divertido aprender!

If a person were ever face-to-face with a huge, hungry animal with sharp teeth, they probably wouldn’t care exactly what that animal was! But from a safe location, can we tell whether it was a crocodile or alligator that wanted to take a bite? By examining their jaw structure, teeth, and other physical features, we can easily tell these two animals apart! Graphic organizers and amazing images highlight each animal’s habitat and other small differences between the two fearsome creatures, showing readers just what creature is lurking below the waters.

Lin invites her friends to her Japanese teahouse. They have rice, fish, and tea. Lin thanks them for coming and her friends thank her for the tea ceremony.