February 12 13 2013 2012 February As soon

February 12, 13, 2013 2012 February As soon as you enter. . . COPY the F. Q. and L. G. ’s QUIETLY F. Q. : What do we need to study to be successful on the Practice Test? L. G. ’s: I can complete Regent questions on seismic waves and the electromagnetic spectrum. I can identify what Earth Science topics I know and need to study. Complete in 5 minutes for a stamp!

THE ELECTROMAGNETIC SPECTRUM Decreasing Wavelength=Higher Frequency (Blue-shifted) Increasing Wavelength=Lower Frequency (Red-shifted)

In the next 7 minutes, complete in your notebook pg 157 #1 -4

HOW TO USE THE EARTHQUAKE TRAVEL TIME GRAPH (pg 11) EXAMPLE: A seismic station is 3000 km from epicenter of an earthquake. How long will it take P waves from this earthquake to reach the seismic station? Ask yourself two questions: 1) What information do I have? 3000 km from epicenter 2) What information am I looking for? How long (time)

We know the distance (3000 km). We’re trying to find the time it will take P waves to travel this distance. 1) Find 3 (3000 km) on the x-axis and, draw a line up to meet the P wave line. 2) Now, draw a line over to the y-axis and read the travel time: 5 min 40 s. It takes P waves 5 min 40 s to travel from an epicenter to a seismic station. How far is the seismic station from the epicenter?

We know the P wave travel time: 5 min 40 s. We are trying to find the distance between the epicenter and the seismic station. 1) Draw a line from the time (5: 40) to the P wave line. 2) Draw a line straight down to the bottom axis and read the distance. . . 3000 kilometers!

A seismic station is 3000 km from the epicenter. If P waves arrive at the station at 4: 25: 40 PM, what time did the earthquake 1) Again, weoccur? find the travel time, 5: 40. 2) Subtract: 4: 25: 40 ------4: 20: 00 The earthquake occurred at 4: 20: 00 PM!

P waves arrive at a seismic station 4: 30 (4 min, 30 s) before the arrival of S waves from the same earthquake. How far from the epicenter is the seismic station?

Here’s what you know: P & S waves arrive at a seismic station 4 min 30 s apart. You are asked to find the distance to the epicenter. 1) Take a sheet of paper and line up the left edge with the yaxis. 2) Make a small, thin, and accurate mark on the paper at 0 time. Make another small, thin, and accurate, mark at 4 min 30 s. Your 2 marks are now 4: 30 apart!

Now slide your paper to the right until one of your marks is exactly on the S wave line and the other is exactly on the P wave line. Now look to see where the bottom of your paper crosses epicenter distance axis. In this case it crosses at exactly 3000 km which is the answer!

Sometimes, instead of giving you the difference in arrival times, you will be given a seismogram. Carefully, mark the P wave and S wave arrival times. Count the number of minutes between the arrival of P and S waves. You now have the difference in P wave and S wave arrival time!

In next 10 minutes, complete in your notebook pg 118 #1 -5 Answers: 1) 3 2) 1 3) 1 4) 3 5) 3

THE PRACTICE TEST (2/14) • • 2 Hour Test (both Thursday classes) 70 multi-guess Will be in the SAME format as the Regents 2 nd half of the test will NOT be in lab – Room number will be posted at the lab door • WILL count as part of your grade under “Projects and Tests” (40%)

TO PREPARE • Review notes from the last 2 weeks • Review Power. Points at http: //concannon 9. weebly. com • Schedule extra help or attend Freshman Center open on Thursday, 8: 30 -9: 30 am • Practice with questions at the website, http: //regentsprep. org/regents/core/questio ns/topics. cfm? Course=ESCI • Look at previous Regents exams at http: //www. nysedregents. org/earthscience

PRACTICE TEST TOPICS • Earth’s Shape and Size • Rate of Change • Density • Big Bang Theory and its Evidence • Gradient • Longitude and Latitude • Time Zones • Electromagnetic Spectrum • Earthquakes • Tectonic Plates • Solar System • Earth’s Structure • P-Wave and SWave Travel Time