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 ...

These days, I’m a geophysicist and know a lot more about Earth’s structure. It has three main layers: The outer skin ... as ...

There's many different layers to the Earth's atmosphere, but 75% of Earth's mass is actually going to be residing in the troposphere, where we are located. Also, we see all of Earth's weather occur in ...

The Earth formed over 4.6 billion years ago out of a mixture of dust and gas ... By the time of the moon-forming impact, the Earth was already separated into these rock and metal layers. However, the ...

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 ...