The sediment comes from eroded rocks carried ... causing them to change into another type of rock. They are usually resistant to weathering and erosion and are therefore very hard-wearing.

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 ...

What comes to your mind when you imagine a river? A stream of water flowing through landscapes? While that's partly true, ...

A compound is a substance that contains two or more elements close elementA pure substance that is made from only one type ... of other rocks that become joined together. 1 Sediment transport ...