Interior Structure of the Earth - SS1 Geography Lesson Note
- Crust: The Earth's crust is the outermost layer and is relatively thin compared to the rest of the Earth. It's divided into two types: the continental crust, which forms the continents, and the oceanic crust, which lies beneath the ocean basins. The crust is where we find mountains, valleys, and various landforms.
- Mantle: Beneath the crust lies the mantle. It's a semi-solid layer composed of solid rock that can flow slowly over geological timescales. The mantle is responsible for the movement of tectonic plates, which causes earthquakes, volcanic eruptions, and the creation of mountains.
- Core: The Earth's core is divided into two layers: the outer core and the inner core. The outer core is composed of molten iron and nickel, while the inner core is solid due to the immense pressure. The movement of the molten outer core generates the Earth's magnetic field, which protects the planet from harmful solar radiation.