John Lockyer 
vida en las capas oceanicas [PDF ebook] 
Unidades de medida

This nonfiction Spanish book provides problems for students to practice converting units and solving measurement problems while learning about marine ecology. Mathematical charts and diagrams help children advance their content-area literacy in math and science. Text features include an index, a glossary, captions, engaging images, and easy-to-read text to direct students back to the text for multiple readings.