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Thursday, May 24, 2012

Nature Study – Leaves

Posted by Cindy on October 29, 2008

It was COLD in Central KY yesterday.  The nature walk part of our study was rather short – a quick trip down to the creek bed to collect a variety of leaves.  But once we got home – the learning and fun began!

We started with a review discussion about the purpose of leaves and why they change colors.  After a bit of struggle getting everyone to pay attention during the discussion, I announced there would be a test later in the day.  (Yep, that meant I had to come up with some sort of test on leaves!  In all that spare time I have, you know.  Lucky for me, I was able to find this quiz online.)  I don’t do tests very often, but it was just the thing needed today to turn their attention back toward our discussion.

Math was next on the list.  Using a few of the leaves each, the kids had to find the perimeter of the leaves in inches and centimeters.  Then had to find the area in square inches, square centimeters and an unknown square unit.  Yarn and a measuring tape made finding the perimeter easy.

The area in square inches was found using one-inch tiles.  A one-inch grid could be used as well.

We used centimeter grid paper for finding the area in square centimeters.  (Simply trace the leaf and count the full squares inside the leaf.  We estimated the half and quarter filled squares to add more area.  For instance, if there were two halves, we would count them as one.  If there was a square about 3/4 full and another 1/4 full, we combined them as one.)

Graph paper was used to find an unknown square unit.  We talked about smaller units making for more accurate measurements.

Finally, we created leaf burst for an art activity to add to the nature notebooks.

Enjoy even more fun with leaves and trees by using:

Photobucket

Chromatography – or Why Do Leaves Change Colors?

Posted by Cindy on September 4, 2007

Our Fun Friday activity last week was an experiment from Science Projects for Holidays Throughout the Year on chromatography.  That’a a big name for separating mixtures, or in this case pigments.  As complicated as the word sounds, the experiment was really very easy.

We started with chromatography of a black water-soluable marker to get a good picture of how pigments are separated during the process.  Black markers are made up of many other colors and they all show up brilliantly during the experiment.

Then, to tie the experiment in with autumn, we did the experiment with green leaves.  Since they’ll soon be changing colors, we talked about photosynthesis, chlorophyll and the true pigments of leaves.  The chromatography experiment allowed us to take the current green pigment and find out what other pigments were in the leaf.  In other words, we were able to get a sneak peek as to what color the leaves will be in a few weeks!  Unfortunately, we’ve been in a drought this year, so the leaves are rather dry.  It took quite a bit of effort to get enough green rubbed onto our coffee filters for the experiment to work.  Even though the results weren’t as brilliant as the markers, we were able to tell that the leaves we chose will be yellow this fall.

Here are several great links for other chromatography experiments! I think we’ll dive into the candy experiment next.

Why Do Leaves Change Colors? Go down a bit for the chromatography experiment

Chromatography Forensic Science Experiment

Paper Chromatography

Paper Towel Chromatography

Candy Chromatography