Free Posters and Five Things You Didn’t Know About Leatherback Seaturtles

Dear Educators,

Watch Leatherbacks Migrate Thousands of Kilometres to their Overwintering Grounds!

Are you following the Great Canadian Turtle Race? We’re tracking leatherback sea turtles as they journey to their wintering waters in the south!

Follow these majestic reptiles on their amazing migration.

Leatherback Seaturtles are fascinating creatures just ask your students, they probably think so too! Did you know that they have been around since the time of the dinosaurs? Or that they can boast the most extensive geographic range of any reptile?
Get your students excited about Leatherbacks. Sharing what we know about wildlife can go a long way for creatures who need our help. Ask your students what they know about Leatherback Seaturtles, and then share these facts:

  1. Leatherbacks can’t swim backwards.
    These reptiles are unable to swim backwards, causing these turtles a lot of grief when they swim into fishing nets and lines in the ocean. Without the ability to back out of them, they can get caught in fishing gear and drown.
  2. Leatherbacks have hundreds of backward facing spines in their mouths.
    Without pearly whites to chomp down on jellyfish, Leatherbacks rely on the two cusps on their upper and lower jaws to grab their prey. To help swallow Jellyfish, their entire esophageal tract is lined with spines that not only prevent their prey from escaping, but also shred jellyfish to pieces as they travel towards the Leatherbacks’ stomachs.
  3. Leatherbacks don’t have hard shells.
    Leatherbacks are the only seaturtles that don’t have hard shells; instead they’re equipped with leathery skinned shells (hence their name!). Their shells made up of a thick layer or oil-saturatated fat, tiny plates, and connective tissue; they can grow over two metres in length.
  4. Leatherbacks have a gland on their foreheads that help them navigate.
    Researchers are learning more and more about these remarkable pineal glands, and are finding that Leatherbacks can thank this soft cover for helping them navigate. Acting as a kind of skylight, the pink spot on the top of their forehead allows sunlight to beam directly into the pineal gland, helping them to keep in sync with the seasons, and to know when to migrate north for food and south to mate.  Moreover, this pink spot atop every Leatherback’s head, is unique to each, individual turtle just like a human fingerprint.
  5. Leatherbacks are the largest of all seaturtles.
    When they hatch, Leatherbacks weigh approximately 45 grams and their carapace ranges between 50 and 75 millimetres in length.  Although mature Leatherbacks can weigh more than 900 kilograms and have carapace lengths longer than two metres, the average weight of Leatherbacks documented in Atlantic Canadian waters is 392 kilograms, and the average carapace length is 148 centimetres.

If your group enjoys these Leatherback facts, be sure to follow the Great Canadian Turtle Race. Check in at TurtleRace.ca for weekly updates that include colorful maps and charts so you can your students can easily monitor the migrating leatherbacks’ progress. Order a free turtle posterfor your group and find more information and resources for educators on Leatherback Seaturtles.

We want to thank you and your classroom for caring about Leatherback Seaturtles and following the race.

Sincerely,
The CWF Education Team

The Inner Life of a Cell

Harvard University selected XVIVO to develop an animation that would take their cellular biology students on a journey through the microscopic world of a cell, illustrating mechanisms that allow a white blood cell to sense its surroundings and respond to an external stimulus. This award winning piece was the first topic in a series of animations XVIVO is creating for Harvard’s educational website BioVisions at Harvard.
http://www.xvivo.net
http://multimedia.mcb.harvard.edu/

Using Veritech Tiles for Gr. 9 Science – Classification of Matter and Physical Properties

By Leila Knetsch.

Variation in instructional strategies is important in the science classroom. As a kinaesthetic/visual learner myself, I have always appreciated the hands-on learning of laboratory work in the science classroom. However, there are other ways to have hands-on learning and one of them is to use Veritech tiles. The picture below shows the set with an elementary workbook but you have to imagine a green tray with a clear lid. The students move the tiles off the green tray and bring them back into the tray as they match them. When they are done, they flip them over, and look at the pattern formed on the other side! It’s quick and excellent feedback for them.

You simply create (or use the two samples below) a list of matching terms and descriptions and use the numbered tiles and tray to make a match. The beauty of it is that you can check your answers instantly because there are 64 different combinations of patterns (series of Vs, arrows, inverted triangles, etc.) that can be checked instantly! If you are an enterprising person, you could create different versions of the same thing and use it as a quiz where students actually hand in the tray of tiles and you could count the ones that they had wrong.

Veritech tiles

(Editor’s Note: The author’s first article on this topic was developed for grade 12 Biology. You may see that article at:  http://stao.ca/res2/mags/2012-jun/11C_veritech_tiles.pdf ).

Click here for data sheets 

Curriculum Connection: Grade 9 Chemistry

Leila Knetsch is the ACL of Science at Albert Campbell CI. She is currently interested in incorporating literacy and technology into science. Leila may be reached at
Leila.knetsch@tdsb.on.ca .

Knetsch

We’d love to hear your comments.

Pop Bottle Water Filtre

Pop bottle water filtre

Water collected from a source typically goes through several processes at a water treatment plant before entering our homes as potable water. This activity allows students to investigate most of the following steps involved in water treatment and to suggest improvements to the treatment system:

  • aeration – water is mixed with air to add oxygen
  • coagulation and flocculation – substance added (e.g., potassium aluminium sulphate) to create sticky globules or ‘flocs’ which collect particulates and bacteria
  • sedimentation – flocs and solids are allowed to settle out
  • filtration – water travels through various substances to remove finer solids, flocs, and micro organisms
  • disinfection – substance (usually chlorine) is added to kill bacteria

Make a pop-bottle water filtre yourself to use as a model for your students.

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Wind Spiral

Spiral

Air has mass, it takes up space, and it moves. A student will be aware that the wind blows on their face on a winter day but may not think of this as air moving. On a large scale, the movement of air is observed by changes in the weather. If you are mailing a parcel at the post office, the postmaster will try to squeeze all the extra air out of a parcel before determining the cost of mailing the parcel. Air can also keep a kite in the air or make a pinwheel spin. In addition to these physical properties, it is important to remember that all living things need air to breathe and to survive.

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