The Earth's interior is composed of four layers, three solid and one liquid—not magma but molten metal, nearly as hot as the surface of the sun. The deepest layer is a solid iron ball ...

The atmosphere has four layers. The troposphere is the layer closest to the surface of the Earth. Next is the stratosphere, which is where commercial airplanes fly. Further out is the mesosphere ...

Ask them what the shell pieces are referred to on the Earth. 4. Ask students what layer of the Earth is shown through the shell. 5. Now ask the students to squeeze their eggs gently until slight ...

It is the thinnest layer and is between 5 and 90 km thick. Earth is divided into four layers: the inner core, the outer core, the mantle and the crust. The solid inner core is made of iron and ...

multicelled life-forms almost four billion years later. What Was Happening on Earth at This Time The Precambrian is the earliest of the geologic ages, which are marked by different layers of ...