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The outermost layer of the Earth is a rocky crust. Beneath it is a plastic, highly viscous upper mantle, followed by a more dense and rigid lower mantle. In the center is a liquid outer core and a solid inner core.

## Structure of the Earth - Wikipedia

en.wikipedia.org/wiki/Structure_of_the_Earth

The interior structure of the Earth is layered in spherical shells, like an onion. These layers can ... The rocks of the crust fall into two major categories – sial and sima (Suess,1831–...

## BBC - GCSE Bitesize: The structure of the Earth

www.bbc.co.uk/schools/gcsebitesize/geography/natural_hazards/tectonic_plates_rev1.shtml

The Earth consists of four concentric layers: inner core, outer core, mantle and crust. The crust is made up of tectonic plates, which are in constant motion.

## The Earth's Layers Lesson #1 | Volcano World | Oregon State ...

volcano.oregonstate.edu/earths-layers-lesson-1

The Four Layers. The Earth is composed of four different layers. .... What are the two main metals that make up the outer and inner core? 4. Describe in your own  ...

## What are the layers of the earth? - Edinformatics

www.edinformatics.com/math_science/layers_of_earth.htm

How seismic waves can detect the mantle, crust, inner core, outer core.

## Layers of the Earth - Our Earth

epicgamer11div1.weebly.com/layers-of-the-earth.html

There are four main layers on Earth. The first layer is called the Crust and it is the thinnest layer of the Earth. The second is the Mantle and it is the thickest layer ...

## The Layers of the Earth: Facts, Composition & Temperature - Video ...

This lesson will discuss the layers that make up the inside of the Earth ... The mantle is huge, going down to a depth of 2,500 km and is like the main part of the cake .... Earth's Surface 8:54; The Four Spheres of Earth: Geosphere, Hydrosphere, ...

## All About the Four Main Layers of the Earth and Their Importance

www.buzzle.com/articles/four-main-layers-of-the-earth.html

Aug 30, 2016 ... The four main layers of the Earth are the crust, mantle, outer core, and the inner core. The planet earth was formed about 4.5 billion years ago, ...

## The Thinnest Layer of the Earth - ZME Science

www.zmescience.com/other/science-abc/thinnest-layer-earth/

Jan 16, 2015 ... The Earth can be divided into four main layers: the solid crust on the outside, the mantle, the outer core and the inner core. Out of them, the ...

## Earth's Interior - Windows to the Universe

www.windows2universe.org/earth/Interior_Structure/interior.html

Earth has a diameter of about 12,756 km (7,972 mi). The Earth's interior consists of rock and metal. It is made up of four main layers: 1) the inner core: a solid ...