Week of March 31, 2014

Monday- Wrap up last week's work.- Frosty lab and worksheet.

Homework= Finish Frosty lab write-up!

Tuesday-
Claim and Evidence essay.
Begin jigsaw for plate tectonics.
-groups 1-6, take photos & discuss.
Go back into bigger groups. airdrop photos and analyze.

optional: Video about minerals in Maine
http://www.crossjewelers.com/video/
Homework= Sample half-life problems.

Wednesday-
Go over homework.
Finish=Go back into bigger groups. airdrop photos and analyze. 
 Claim & Evidence Essay-outline.

Thursday-
Use this period to write your essay. Have someone proofread it from your iPad.  On the bottom of your rough draft, have that proofreader sign it.  Make final edits and do final copy for Friday.  Please submit it electronically by email to shardy@aos92.org.  Turn in outline on Monday.

 Friday-
 Make 9 groups out of the class.  This will be some groups of 2 and some of 3.
Count off numbers 1-9.
Find what landform group you are by looking below.

Each person do the following on the iPad:
If you do not have an iPad, ask for the alternative assignment.

The Earth has some amazing surface features. How did they get there?

1. Use: http://iweb.jackson.k12.ga.us/cstewart/geology/Home.html
to define- constructive force and destructive force. Define landform.
2. Your group will be assigned a category of landforms. First, find a picture of the landform. Paste it in a ppt or keynote. Next, go to google earth and take a shot of where it is ( on a map). Finally, Label it with landform type, location and then explain the force that created the landform. Were these forces constructive or destructive? Was the landform made quickly or over time?
Each slide should have two pictures and labels as described above. You should have 12 different landforms= 12 slides( MINIMUM)... PLUS an end slide with the URLs of your sources. YOU MAY DO MORE THAN 12 SLIDES.  IF YOU FINISH EARLY YOU ARE ENCOURAGED TO DO MORE!

= TEST GRADE!

Week of March 24, 2014

MONDAY-
 -go over homework & video questions & tables & slides & read aloud

Tuesday-
DATING!
www.lakelandschools.org/webpages/jfelipe/files/EARTHHISTORY.ppt

-overhead ages of earth layers ‎




DATING INDIVIDUAL FOSSILS
Paleontologists use many ways of dating individual fossils in geologic time.

1. The oldest method is stratigraphy, studying how deeply a fossil is buried. Dinosaur fossils are usually found in sedimentary rock. Sedimentary rock layers (strata) are formed episodically as earth is deposited horizontally over time. Newer layers are formed on top of older layers, pressurizing them into rocks. Paleontologists can estimate the amount of time that has passed since the stratum containing the fossil was formed. Generally, deeper rocks and fossils are older than those found above them.
2. Observations of the fluctuations of the Earth's magnetic field, which leaves different magnetic fields in rocks from different geological eras.
3. Dating a fossil in terms of approximately how many years old it is can be possible using radioisotope-dating of igneous rocks found near the fossil. Unstable radioactive isotopes of elements, such as Uranium-235, decay at constant, known rates over time (its half-life, which is over 700 million years). An accurate estimate of the rock's age can be determined by examining the ratios of the remaining radioactive element and its daughters. For example, when lava cools, it has no lead content but it does contain some radioactive Uranium (U-235). Over time, the unstable radioactive Uranium decays into its daughter, Lead-207, at a constant, known rate (its half-life). By comparing the relative proportion of Uranium-235 and Lead-207, the age of the igneous rock can be determined. Potassium-40 (which decays to argon-40) is also used to date fossils.
   
   The half-life of carbon-14 is 5,568 years. That means that half of the C-14 decays (into nitrogen-14) in 5,568 years. Half of the remaining C-14 decays in the next 5,568 years, etc. This is too short a half-life to date dinosaurs; C-14 dating is useful for dating items up to about 50,000 - 60,000 years ago (useful for dating organisams like Neanderthal man and ice age animals).
   
   Radioisotope dating cannot be used directly on fossils since they don't contain the unstable radioactive isotopes used in the dating process. To determine a fossil's age, igneous layers (volcanic rock) beneath the fossil (predating the fossil) and above it (representing a time after the dinosaur's existence) are dated, resulting in a time-range for the dinosaur's life. Thus, dinosaurs are dated with respect to volcanic eruptions.
4. Looking for index fossils - Certain common fossils are important in determining ancient biological history. These fossil are widely distributed around the Earth but limited in time span. Examples of index fossils include brachiopods (which appeared in the Cambrian period), trilobites (which probably originated in the pre-Cambrian or early Paleozoic and are common throughout the Paleozoic layer - about half of Paleozoic fossils are trilobites), ammonites (from the Triassic and Jurassic periods, and went extinct during the K-T extinction), many nanofossils (microscopic fossils from various eras which are widely distributed, abundant, and time-specific), etc.

 more on carbon dating-
http://www.bbc.co.uk/history/ancient/archaeology/carbon_dating_01.shtml#top
momre-
http://www.sciencecourseware.org/VirtualDating/

WORKSHEET on tracks and potassium-argon dating

Wednesday-

-1.. Lab -decay of MMium

Thursday-
1.  Lab due.
2. Frosty's demise... :(

Friday-

1. Both labs- go over & analyze
2. Maybe a little quiz...

Week of March 17, 2014

Monday-
I'm sorry I'm not there.  MAJOR stomach flu.  yuck!

Periods 1,4,7,&8, finish the movie. https://www.youtube.com/watch?v=RLMeA3M_PaU
 Unplug and plug back in the apple tv.  Play the rest of the movie and finish answering the question.  If the apple tv doesn't work, watch it on your iPads with headphones.  Keep your finished worksheets for me.
Next, periods 1,4, & 5:
Color & label layers of the Earth- worksheets are on my black table.
use:
http://www.learner.org/interactives/dynamicearth/structure.html
http://www.windows2universe.org/earth/Interior_Structure/interior.html

If worksheet is finished, can watch:
http://www.brainpop.com/science/earthsystem/earthsstructure/

remember login is:  winslowjh    brainpop

Tuesday
Earthviewer- tutorial & guide
Difference between Eon, Era, & Period
Make a table showing the Eons, Eras, & Periods
How did the oxygen and carbon dioxide levels fluctuate during this time?
How did the day length change?
Describe the continents.


Wednesday-
-tell me what you know, 1,4,5
periods 7 & 8- earth viewer assignment


Thursday- 1/2 day
Periods 1,2,3,4 & 5.
Periods 3 & 4 assembly!

Earthviewer discussion

Week of March 10, 2014

Monday- 1. Go over test.
2. RUBBER BAND ENTRY DUE!!!!!
working on it in class
H=DUE THURSDAY= Read and take notes, define vocab and answer "check your reading , and reading visuals" questions from:
Text -
http://www.classzone.com/science_book/mls_grade7_FL/465_471.pdf


Tuesday- History of the Earth video & worksheet

Video for class- History of the Earth
https://www.youtube.com/watch?v=RLMeA3M_PaU

Wednesday- continue...

Thursday - Snowday- work moved to Friday...

Go over History worksheet & HOMEWORK IS DUE!