In this video, Mr. Bradley will use starburst candies to demonstrate how rocks are formed. Rocks can be organized into three categories: sedimentary, metamorphic and igneous rocks. Sedimentary rocks, such as limestone and coal, are formed when small pieces of rocks and dirt are squeezed together. But what happens when these pieces are underground, where there is great pressure from overlaying rocks and heat from magma? In that case, they undergo a chemical change to form the second type of rocks—metamorphic rocks. The third type, igneous rocks, are formed when hot lava cools down. Wind and rain can chip these rocks into sediments, which can then be transported to water bodies, thereby initiating the rock cycle.
This video also features cool rock formations around the world.
The video satisfies the 4-ESS1-1 requirement of fourth-grade science proficiency.
Students who demonstrate understanding can: 4-ESS1-1. Identify evidence from patterns in rock formations and fossils in rock layers to support an explanation for changes in a landscape over time.