Mark Twain imprint: 24 books

Have you ever wondered why astronauts float in space or why they weigh less on the moon? Written for students in grade 4, Mass and Weight explains mass and weight and how they relate to gravity. This 22-page book includes a glossary of bold-faced vocabulary words, reading activities, an index of terms, and an answer key.

Have you ever wished that you could follow a monarch butterfly? If you did, you would find yourself in many different places! Written for students in grade 3, Monarch Butterflies covers where monarchs migrate, what they eat, and how they change. This 22-page book includes a glossary of bold-faced vocabulary words, reading activities, an index of terms, and an answer key.

Some people think that the sound of a honeybee is frightening, but honeybees are actually very helpful! Written for students in grade 3, Honeybees explains why honeybees are important insects. This 22-page book includes a glossary of bold-faced vocabulary words, reading activities, an index of terms, and an answer key.

Have you ever wondered what causes a rainbow or how a prism works? Written for students in grade 4, Rainbows and Light explains what causes a rainbow and how a prism works! Students also learn about wavelengths, filtered light, and color. This 22-page book includes a glossary of bold-faced vocabulary words, reading activities, an index of terms, and an answer key.

Have you ever wondered what plant and animal life can survive in a desert? Written for students in grade 5, Life in the Desert shows students how these animals and plants adapt to their surroundings. This 22-page book includes a glossary of bold-faced vocabulary words, reading activities, an index of terms, and an answer key.

Did you know that hurricanes are storms that form over the ocean? Written for students in grade 5, Hurricanes covers the many characteristics of hurricanes, how they form, and how they are categorized. This 22-page book includes a glossary of bold-faced vocabulary words, reading activities, an index of terms, and an answer key.

Have you ever wondered what El Niño was? Written for students in grade 6, Ocean Currents and El Niño discusses El Niño, other ocean currents, and how ocean currents affect the climate and people around the world. This 22-page book includes a glossary of bold-faced vocabulary words, reading activities, an index of terms, and an answer key.

Have you ever wondered what causes earthquakes or tsunamis? Written for students in grade 6, The Trembling Earth helps students find answers to questions about natural disasters. This 22-page book includes a glossary of bold-faced vocabulary words, reading activities, an index of terms, and an answer key.

Readers Advance uses a series of full-color nonfiction science readers designed to address the challenges of reading in a content area. Each student book is written around a single science concept. The selected science topics correspond to the most popular science topics currently being taught at...

Have you ever seen a bird so small that you weren't sure that it was a bird? It was probably a hummingbird! Written for students in grade 3, Hummingbirds helps students find out more about hummingbirds. Students see many beautiful pictures of different kinds of hummingbirds in the book. This 22-page...