It creates the Earth's magnetic field and is about 1,400 miles (2,300 kilometers) thick. The next layer is the mantle. Many people think of this as lava, but it's actually rock. The rock is so hot ...

Despite seeming like a relatively stable place, the ... in the rock record. For example, in the rocks exposed in the walls of the Grand Canyon (Figure 1) there are many horizontal layers, which ...

How's your knowledge of Earth's geology? Flat, round or global?

Different textures and mesmerizing layers of multitoned or multicolored earth can be used to create ... carries a sense of warmth to any project. Rock salt is a chemical sedimentary rock that ...

The rocks on Earth are constantly changing due to many ... and eroded settle out of slow moving water. Over time, the layers are compressed and glued together.Metamorphic rocks are formed from ...

Not far from the rippled textures are rocks made of layers that are regular in their spacing and thickness. This kind of rhythmic pattern in rock layers on Earth often stems from atmospheric ...

What Was Happening on Earth at This Time The Precambrian is the earliest of the geologic ages, which are marked by different layers of sedimentary rock. Laid down over millions of years ...

It turns out the answers are in Earth's rocks. Even the Greeks and Romans realized that layers of sediment in rock signified old age. But it wasn't until the late 1700s -- when Scottish geologist ...

and the athenosphere, the portion of the mantle that is solid, but made up of hot, weak, flowing rock. Read about the latest research on Earth's layers below.