G4 HTWW: Grade 4 How The World Works

Got a hunch about something but don’t know how to prove it? In this BrainPOP movie, Tim and Moby will walk you through the steps of the scientific method, which can be used to design any kind of experiment! First, Tim will show you how to make observations and develop inferences based on them. Then, you’ll learn how to form a hypothesis, make a prediction, and design a test to see whether or not your prediction was correct. Finally, you’ll learn why it’s important for others to be able to repeat your experiment! You’ll also learn how hypotheses become theories, and why there’s really no such thing as a scientific fact! So don’t just take a wild guess -- use the scientific method and be sure!

The scientific method might seem like a rigid series of steps for scientists to follow. But it's only one part of the scientific process, which is much more open-ended! Making sense of nature's mysteries requires creativity, collaboration, and lots of persistence. It often starts with an interesting observation that prompts scientists to ask questions about the world around them. To answer those questions, they propose a hypothesis, an explanation that doesn't yet have much evidence. To test the hypothesis, they design experiments. Sometimes the results support the hypothesis, and sometimes they rule it out. That gives scientists a chance to ask new questions, propose new hypotheses, and design new experiments to gather more evidence. Conclusions are published in peer-reviewed papers, which have been checked by other scientists for accuracy. If a hypothesis gains enough support, it becomes known as a theory. The process is a lot like detective work, full of twists and turns and unexpected discoveries. Click "play" to learn more!

"Ready to get your hands dirty? Let Tim and Moby introduce you to the complicated world of soil! In this BrainPOP movie you’ll learn what it is that makes soil good for growing things. Tim and Moby will teach you about the difference between weathering and erosion; how dead plants help other plants grow; and how roots can actually break up rock. Discover what goes into a soil profile and learn how to name soil’s three main layers. Finally, you’ll find out what happens when you hit bedrock. (It probably means you’re done digging!)"

"Vermicomposting, composting with the help of hungry red wiggler or red earthworms, is an incredible way to create healthy soil while reducing waste like food scraps, yard debris, uncoated paper products, and more. "

The substance used to make something is called a material. A school desk, for example, may be made from wood, plastic or metal – or a mixture of all three materials.