Construyendo una casa

Snow falls when it is cold. Find out all the different ways snow can fall during cold weather. Paired to the fiction title Building a Snowman.

People all over the world love pets. Some pets are popular in certain areas of the world. Let’s find out about the popular pets around the world. Paired to the fiction title The Perfect Pet.

Snow falls when it is cold. Find out all the different ways snow can fall during cold weather. Paired to the fiction title Building a Snowman.

A team helps each other. A team works together. A team communicates. Find out how to be a team player. Paired to the fiction title My Favorite Sport.

Ice cream is a solid. But when it melts, it becomes a liquid. Solids can change to liquids and back again by melting and freezing. Read this Spanish-translated book to learn what happens when heat and cold and solids meet.

How does a frog grow? Beginning as a tiny egg and then a tadpole, a frog stays mostly in the water until it is fully grown.

Simple text and photographs introduce the animals of the Arctic, grouped to provide practice in solving easy addition problems.

Aunque hoy en día el efecto invernadero aparece en la prensa con frecuencia, se le conoce desde mediados del siglo XIX y siempre se ha sospechado de la influencia de la actividad humana en él. Sin embargo, para constatar el efecto de calentamiento global actual y aceptar la responsabilidad del hombre en su rápido crecimiento, hubo que luchar contra intereses ligados al desarrollo industrial que supuestamente está sustentado por el conocimiento científico. "Esta historia empieza a principios del siglo XIX, cuando unos científicos descubrieron que nuestro planeta no siempre tuvo el mismo...