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You should go back and re-watch it.

Many also consider this the worst part of geology, and I certainly confess to having felt that way myself on more than one occasion.

For example, the processes that transport and deposit sediment in a river are the same today as they were a billion years ago.

What is an example of relative age? Remember from lecture the question--which came first, a rock layer was deposited, or that rock layer got eroded away? In a similar example, an excavates into a subsurface layer of rock.

Steno stated that sedimentary rocks are formed in continuous, horizontal layers, with younger layers on top of older layers.

Nicholas Steno formulated the principles in the 17th century that allow scientists to determine the relative ages of rocks.

Why are sedimentary rocks more useful than metamorphic or igneous rocks in establishing the relative ages of rock? What are the geological events that you can find in this image? The Principle of Original Horizontality states that layers of sediment are originally deposited horizontally under the action of gravity.

That rock had to eventually become exposed at the surface, where a chunk of the rock weathered from the outcrop and tumbled down a stream, rounding it.

If some object or piece of rock is included inside a second rock, the first object or rock had to already exist at the time of formation of the second.