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 ...

Earth formed over 4.5 billion years ago from a swirling cloud ... Keep reading to learn more about Earth's different layers, its atmosphere, and what makes the "blue planet" unique.

The Earth is made up of different layers: Therefore, instead of tectonic plates moving because of the convection currents, evidence suggests it is the plates that drive the convection. Slab pull ...

About 4.5 billion years ago, gravity coaxed Earth to form from the gaseous ... of silicate rocks and metals—differentiated into four layers. At the planet's heart lies the inner core, a solid ...

The Earth has a layered structure made up of the core, the mantle and the crust. Different elements are present in different parts of the Earth’s structure. The crust is made from enormous ...

Geologists have calculated the age of Earth at 4.6 billion years ... Even the Greeks and Romans realized that layers of sediment in rock signified old age. But it wasn't until the late 1700s ...

Instead, it's documented in layers and layers of rock deposited ... Geology Introduction: The Changing Planet Earth has been significantly altered over its 4.6-billion-year history by climate ...