In math, we will be taking a look at factors. We will talk about using factor trees to help us discover the prime factorization of numbers. In addition, we will be practicing finding the greatest common factors of sets of numbers. While we will not have a quiz this week in math, be on the lookout for a few nights of homework. HERE is an online practice program about factors you may want to check out.
In science, we will be getting our hands dirty talking about soil. We will have a lesson on Monday, and will work on a followup choice sheet for the next two weeks. This Friday (Sept. 30) will be a vocabulary test on these words:
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
Next Friday (Oct. 7), we will be having a test on what we've learned about soil. Here is a study guide you can use to help you prepare:
Soil Study Guide
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 diagram)
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
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