1. distinguish between numerical dates and relative dates. 2. sketch and label four simple diagrams that illustrate each of the following: superposition, original horizontality, lateral continuity, and cross-cutting relationships. 3. what is the significance of an unconformity? 4. distinguish among angular unconformity, disconformity, and nonconformity.

1.- A numerical date means a specific number of years that have passed since a ceratin event.

3.- They will show geological events that are really important historically, they will also help us identify the periods of time that are missing from the record.

4.- Angular conformity: Underlying rocks are tilted sideways before formation of the erosion surface

Disconformity: If rock layers are not tilted before younger layers, but the boundary overlap them still represents millions of years of time

Nonconformity: Erosion will be forming on top of rocks that are not layered

a is the final ! : )

the density would be a smaller number.