Water is constantly changing form and moving around the environment in the water cycle. Water exists in three forms. It changes from one form to another as it moves from the ground to the air and back to the ground again. Reading Essentials in Science.
The immune system is a group of cells, tissues, and organs that work together to defend a body against invasion by harmful microbes. Reading Essentials in Science.
Scientists have discovered that stars are not equal. They vary in size and color. Variable stars change in brightness over the course of hours, days, weeks, or years. Reading Essentials in Science.
This book introduces the various types of environments in an ocean and along an ocean's shore, including rocky cliffs where hardy plants grow and the underwater communities of the coral reefs. Reading Essentials in Science.
This book is an introduction to biomes and ecosystems and provides background for the in-depth discussion of the tropical forest biome. Reading Essentials in Science.
This book is an overview of the solar system, which consists of the Sun, the nine planets and their moons, comets, asteroids, and meteoroids. Reading Essentials in Science.
This book discusses how Earth is made of rocks and minerals. Reading Essentials in Science.
This book is an introduction to the concept of sound, discussing its forms and the laws that govern it. Reading Essentials in Science.
This book presents a short study of the skin, discussing the skin's layers, how skin protects the body, and what to do to keep it healthy. Reading Essentials in Science.
The goal of all organisms is to stay alive and reproduce within a changing environment. Regulation and behavior help species accomplish this. Reading Essentials in Science.
This book is an introduction to biomes and ecosystems and provides background for the in-depth discussion of the freshwater river biome. Reading Essentials in Science.
This book introduces simple machines, including the lever, wheel and axle, pulley, inclined plane, screw, and wedge, and explores the use of simple machines and how they make work easier. Reading Essentials in Science.
This book explains how the Sun is very important to life on Earth, as it provides energy for most food chains, plays a role in the air and water cycles, and is at the heart of several sources of electricity. Reading Essentials in Science.
This book discusses the beauty, formation, and history of sedimentary rocks. These rocks cover 75 percent of Earth's surface. Reading Essentials in Science.
This book takes a scientific look at the seasons and weather patterns. Reading Essentials in Science.
This book discusses the skeletal and muscular systems and how they work together to provide support, protection, strength, and movement for the body. Reading Essentials in Science.
This book discusses the make up of soil, its formation and how taking care of soil will reap benefits for all living things. Reading Essentials in Science.
This book looks at the different states in which matter can exist and how the properties of matter change when the state changes. Reading Essentials in Science.
This book is an introduction to biomes and ecosystems and provides background for the in-depth discussion of the ocean biome. Reading Essentials in Science.
Oceanography is the study of the ocean's composition, movements, and organisms. Reading Essentials in Science.
This book describes the process of making paper. Reading Essentials in Science.
Isaac Newton's laws of motion describe inertia; the relationship between force, mass, and acceleration; and action/reaction. Reading Essentials in Science.
This book discusses how physical activity has numerous important benefits, such as building strong bones, powerful muscles, and a strong heart. Reading Essentials in Science.
All living things are connected to one another and their environment. Groups of living and nonliving things that interact within an environment are called ecosystems. This book describes ecosystems and how they function. Reading Essentials in Science.
This book discusses how personal hygiene is the way people take care of themselves. Reading Essentials in Science.
