John Lockyer 
Life in the Ocean Layers [PDF ebook] 

Explore the layers of the ocean! Students will learn about the animals and plants that live in the various zones: the sunlit zone, the twilight zone, the midnight zone, and the abyss zone. Along the way, students will learn about different units of measurement including meters, yards, feet, pounds, and ounces. With vibrant photos, math charts and diagrams, grade-appropriate text, and informational text features to help navigate the text, students will learn practical, real-world applications of math skills as they learn units of measure and build their STEM skills.