El Pacto Del Mayflower /

A simple biography of the naturalist who founded the Sierra Club and was influential in establishing the national park system.

Follows The Thirteenth Amendment That Freed The Slaves, The End Of The War, And The Death Of President Abraham Lincoln.

Defines levers, explains their functions, and suggests simple experiments to demonstrate how they work.

Describes what early planes and air travel were like, how planes were developed to travel faster, and presents some pioneers of aviation.

La vida puede volverse de pronto el peor circuito de carreras. Esa es la impresión que tienen Javier y Paula cuando descubren, con 15 años, que van a ser padres. A partir de ese momento, aunque los adultos de su entorno sean un apoyo, tendrán que ser ellos los que tomen sus propias decisiones.

This series will capture the attention of ELL students with its irresistible, full-color photographs of young animals in their natural habitats. The Spanish text uses authentic language to describe animal characteristics and life cycles. Each chapter includes a question-and-answer feature about the animal's behavior and physical traits, while a two-page "animal profile" at the end of each book provides quick facts about the animal's size, senses, habitat, and animal relatives.

Mariana the the sea turtle and her fellow hatchlings have an adventure on their first trip to the ocean.