Unit C: Earth's Surface
Chapter 1: Earthquakes and Volcanoes
Chapter 1 Introduction
Earth is a planet that is always changing. When Earth's crust moves, earthquakes occur and volcanoes erupt. While both can be dangerous and scary, they are also natural Earth processes that have shaped the surface of our world.
Click on the button below to watch and interact with a video about Earthquakes and Volcanoes. |
Chapter 1, Lesson 1: What are the Layers of the Earth?
Summary
Earth is made up of three layers. The crust is the outer layer of Earth. The mantle is the middle layer. The inner layer of Earth is the core. Earth's crust and upper mantle are broken into giant plates that move very slowly. Click on the button below to watch and interact with a video about the Earth's layers. |
Chapter 1, Lesson 2: What Causes Earthquakes?
Summary
A fault in Earth's crust is a break along which rocks move. An earthquake is the vibrations produced when energy builds up and is quickly released along a fault. Scientists use the Mercalli scale and the Richter scale to measure earthquake intensity. Click on the button below to watch and interact with a Bill Nye video about earthquakes. |
Chapter 1, Lesson 3: How do Volcanoes Form?
Summary
A volcano is a mountain that forms when melted rock called lava flows out onto Earth's surface. Most volcanoes form along plate edges. Volcanic eruptions add crust to the Earth and can be harmful. Lava flows can make soils rich in minerals that help crops grow. Click on the button below to watch and interact with a Bill Nye video about volcanoes. |
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