1. Occurs mostly along spreading centers where the magma rises forming new crust. (e.g. East Pacific Rise, Mid Atlantic Ridge.). In a divergent boundary, plates move away from each other

2. States that due to the influence of gravity, all sediment is originally deposited horizontally. However, many layered rocks are no longer horizontal. Based on the law of original horizontality, the rocks that were tilted may be due to later events such as tilting episodes of mountain building

3. States that any piece of rock that has become included in another rock or body of sediment must be older than the rock or sediment into which is has been incorporated

4. Occurs when plates slide past each other.

5. Is the process of determining the absolute age of a sample based on the ratio of parent isotope to daughter isotope. In order to use this, you need to know the half-life, how long it takes for half of a sample of the isotope to decay, of the parent isotope.

6. It allows us to assume that similar layers of rock or sediment that are separated by a valley or other erosional feature were once continuous.

7. States that in an undisturbed succession of sedimentary rock, the oldest layers are on the bottom.

8. States that any piece of rock that has become included in another rock or body of sediment must be older than the rock or sediment into which is has been incorporated

9.______________ causes the rocks to collide with each other. This can make the rocks come together or make the plates rise

10, ____________ is a fold that arches upward