Tuesday, November 4, 2014

Population vs Population Density

Welcome, first timers!  My students can earn extra credit by reading this post and discussing it with an adult.  Read, discuss, then follow the instructions at the bottom.

What is the difference between population and population density?

Population = total number of people.  Population density = number of people in a certain area; how tightly packed together people are.

When my students came in today, we took the population of the class.  They began working on a short bellwork I made up.

I asked questions like what's the population of Box City, what is the population/ population density for each quarter, and what's the population density for Box City...  Pretty simple.

In the middle of working on this, we took a time out and changed the population density of our class.  Generally speaking, it's pretty even.  We decided to concentrate it in a box.

I like to tie things together, so I pointed out that ancient civilizations were almost always found near rivers - population density is higher around rivers.  So, Tito was our river first hour.  You can see him forming a delta with his arms in this picture:

Tying it together even further, I mentioned that to be recognized as an actual civilization, that civilization had to develop cities.  More and more people moved to these cities by rivers.  The movement into cities is called...   EVERYBODY NOW!!!  ______________________.  (Remember this blank, you will need it later...)

So, students moved into the city - concentrating our class's population density in this box.  As of 10:31 AM, first hour has the 2014 record with 29 people in the box:

Yeah...  second hour didn't even have a chance:

Notice in that first picture - all the empty desks.  Although the population of the class didn't change, the population density did.  Our population density increased around the Tito River because of the silt, the water for transportation and trade, water for our crops and animals, for fishing, and drinking water of course.

If I remember to take pictures throughout the rest of the day, I'll post them on here around 3:15.

Students: if you want extra credit for reading and discussing the blog, you were to have read and discussed it with an adult.  Explain to them the difference between population and population density.  Tell them about the map we looked at as well.  Explain to them why India was shaded darker than China - even though China had more people.

Then, find a scrap of paper (I wouldn't print anything out... ink is expensive...)  Write down the word that goes in the blank above.  If you don't remember that word, write two sentences from your conversation.  Then, have the adult you discussed the blog with sign the paper.  Turn it in tomorrow in the extra credit tray.

See you then.

*Alright - here are the rest of the pictures, sorry it's after 3:15.*

Fifth hour broke 1st hour's record: 30.

Sixth hour did not break fifth hour's record: 29.  The first picture shows a town with a low population density...  Well, right now it's really low...  0 people per... square box of tape...  And behind it, the town with the much higher population density.  31 people per square box of tape...  (That's counting the river.)

Seventh hour: Helmuth makes a cameo.  They had 28, I believe.


Hopefully by concentrating our population into that box of tape the students understand the difference between population and population density.  I guess we'll find out on the test.  (Don't worry, it's not for a while.)

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