## Sunday, October 7, 2012

### The Week of October 8, 2012

What beautiful weekend in Savannah it has been!  I hope you've taken advantage of every second of your time off, and I look forward to hearing about how you spent your weekend when we gather back at Ellis tomorrow.

This week in math we will be talking about ratios and rates.  Your first questions may be "what in the world is a ratio!?!?"  Well, you will soon come to see that the work we've been doing with fractions and division fit nicely into our ratio lessons we will have this week.  You actually already have all the knowledge you need to be ratio/rate experts!  This site has some great explanations as to what ratios are and how you may use them in your daily life.  Do you want some more practice with ratios?  Check out this game.  For even more practice, be sure to complete your ratio TenMarks activity this week. It is due by Friday.  You will have two homework assignments, also.  All this practice will hopefully prepare you for a quiz on ratios this Thursday.

In science, we will be continuing to discuss soil.  On Monday, we will focus specifically on the differences in soils found in different climate zones around the world.  Here is the PowerPoint I will present:

I will give you plenty of time to continue with your "Rake the Leaves" choice sheet.  The three assignments from this sheet are due this Friday.  In addition to that, your science journal starter is also due Friday.  We will finish our research about soil at the end of the week when you take your soil test.  Here is what you will need to know for the test:

SOIL VOCABULARY

soil- a loose mixture of rock fragments, organic material, water, and air that can support the growth of vegetation
soil structure- the arrangement of soil particles
soil texture- the soil quality that is based on the proportions of soil particles
bedrock- the layer of rock beneath soil
humus- dark, organic material formed in soil from the decaying remains of plants and animals
leaching- the removal of substances that can be dissolved from rock, ore, or layers of soil due to passing of water
parent rock- a rock formation that is the source of soil

SOIL TOPICS
Weathering (rock materials are broken down)
1.     chemical weathering (weak acids, air)
2.     mechanical weathering (ice, plants, abrasion)
Soil (loose mixture of rock, organic material, water, and air)
1.     residual soil- remain above parent rock
2.     transported soil- blown or washed away from parent rock
3.     Soil Horizons (See picture below)
4.     Soil and Climate
a.    Tropical Rain Forest- Nutrient poor soil because of leaching, thin topsoil, and lush vegetation with great demand for nutrients
b.    Desert- low rate of weathering means soil is created at a slower rate
c.     Temperate Forest and Grasslands- Some of the most productive in the world because of high level of weathering (moderate rain, freezing temperatures).
d.    Arctic- Slow soil formation.  Little rain and cold temperatures cause animals/plants to decompose slowly.  Little humus.
5.      Soil Conservation
a.    Ways to stop erosion (loss of topsoil)
i.     contour plowing- plow across the slope of hills
ii.     crop rotation- planting different crops from year to year to use less nutrients

Soil Horizons

Ms. Carol and myself will be sending home progress reports this week.  Please remember to review it with your family, sign it, and return it to your homeroom teacher Tuesday morning.  If you have any questions or comments, simply write them on the coversheet of the progress report, and we will get back to you as quickly as we can.

I'm looking forward to another great week,
Mr. Trent