What goes up must come down! How often have you heard this saying? This typically refers to the effects that gravity has on objects. Without gravity our lives and surroundings would be very strange! Let this physical science e-book pull you into learning about the power of gravity both on Earth and out of this world. Teach third-grade students about mass, weight, inertia, gravity, and more with the colorful images and fun facts in this high-interest informational text. Featuring a hands-on "Think Like a Scientist" lab activity that is aligned to the Next Generation Science Standards, this e-book helps students apply what they've learned in the text and supports STEM instruction. Helpful diagrams and text features, such as a glossary and index, are also included to improve content-area literacy.