Lab Exam 2

Question 1

Two types of seismic waves that are recorded on seismographs?
Which one is recorded first?

Answer 1

Primary waves - P waves (arrives first)

Secondary waves - S waves

Question 2

How can you figure out the distance between an earthquakes epicenter to a seismograph station?

Answer 2

by the time lapse between the S & P waves

Question 3

How can you find the epicenter of an earthquake?

Answer 3

Each epicenter of the three closest seismic stations must be found. You draw a circle around each seismic station and where the circles interest is where the original earthquake took place.

Question 4

The Law of Superposition

Answer 4

The basic law of geochronology.
This states that the layers of rocks are placed with the youngest rocks on the top layer and the oldest rocks are the bottom layer.

Question 5

The Principle of Original Horizontality

Answer 5

All sedimentary rocks are placed originally laid down horizontally.

Question 6

An igneous intrusion that cuts across surrounding rock, is called what?

Answer 6

A Dike

Question 7

Parallel intrusion that is in the ore-existing rock layer, is called what?

Answer 7

A Sill

Question 8

Large igneous rock bodies, usually circular or dome shaped, that crystallize at depth and are exposed by erosion, is called what?

Answer 8

A Batholith

Question 9

How can you determine the relative age of the tectonic activity?

Answer 9

By using the superposition concept.

Question 10

What is a compression fault?

Answer 10

when two sides are pushed together

Question 11

What is a tensional fault?

Answer 11

when two sides are pulled apart