Layers of the Earth

the outer layer mostly composed of silicon and oxygen

Forming the vast, deep ocean floors. It is generally younger, thinner and denser.

the most common rocks on oceanic crust that is also high in iron and magnesium.

Comprises the major land masses on Earth and are exposed to the atmosphere.

Continental crust is older, thicker and less dense does and can be regarded as _____ in composition that is also high in silica and aluminum based rocks.

the middle layer with thickness of 2885 km.

(composed of olivine and pyroxene) rocks that are formed within the mantle.

(480 C to 900 C); Roughly 410 km, solid rock mass

(3880 C max); Max. thickness of 2,700 km, plastic and can flow very slowly (~1cm/year to 5 cm per year).

innermost layer

liquid iron alloy

solid iron and nickel alloy