Structure of the Earth | AQA GCSE Geography | Tectonic Hazards 1

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This topic video looks at the different layers of the Earth, along with their properties.

This topic is part of the AQA GCSE Geography course - Paper 1: Unit 1A - The Challenge of Natural Hazards

Here is the playlist to use to study and revise all the topics for Paper 1: Unit 1A - The Challenge of Natural Hazards:

VIDEO TIMESTAMPS
0:00 Introduction
0:48 Structure of the crust (continental and oceanic)
1:29 Lithosphere and tectonic plates
2:09 Asthenosphere and its properties
2:49 Lower mantle and core

VIDEO SUMMARY
In this video, the structure of the Earth is examined, highlighting its various layers and their characteristics. The Earth is divided into three main layers: the crust, mantle, and core. The crust, the outermost layer, is further classified into continental and oceanic crusts, which differ in thickness, density, and composition. The lithosphere, consisting of the crust and the upper rigid part of the mantle, is broken into tectonic plates that slowly move over the upper mantle. The lithosphere is solid and brittle, leading to earthquakes along plate boundaries. Below the lithosphere lies the asthenosphere, a denser and weaker layer where rocks are semi-molten and ductile. The mantle is predominantly solid, but the asthenosphere can flow due to high temperatures and pressure. Deeper in the mantle is the lower mantle, which is hotter, denser, and less ductile than the upper mantle. Finally, at the center of the Earth is the core, under immense pressure and consisting of a solid inner core and a liquid outer core. This video provides an overview of the Earth's structure, highlighting the distinct layers and their properties.

KEY TERMS IN THE VIDEO
Structure of the Earth, Crust, Mantle, Core, Lithosphere, Tectonic plates, Asthenosphere, Earthquakes, Upper mantle, Lower mantle.

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