Chapter 2
Lesson 1
Uniformitarianism is the geologic
principle that the same geologic processes
that operate today operated in the past to
change Earth’s surface.
Erosion is the process of wearing down
and carrying away rocks.
Mr. Parr Song: Rock Cycle (No facts)
http://www.yo
utube.com/wat
ch?v=53lMdHzv
GCQ
Weathering is the process that breaks
down rock and other substances.
The type of weathering in which rock is
physically broken into smaller pieces is
called mechanical weathering.
Chemical weathering is the process that
breaks down rock through chemical
changes.
Abrasion refers to the wearing away of
rock by rock particles carried by water,
ice, wind, or gravity.
Wedges of ice in rocks widen and deepen
cracks in a process called frost wedging.
Iron combines with oxygen in the
presence of water in a process called
oxidation.
Permeable means that a material is full of
tiny, connected air spaces that allow
water to seep through it.
8G - Rocks and weathering (2 facts)
http://www.youtube.com/watch?v=R6ctGm0nrns
Bill Nye the Science Guy (5 facts)
http://www.youtube.com/watch?v=9Xv1DoqkARQ
Mr. Parr Weathering and Erosion Song (No facts)
http://www.youtube.com/watch?v=2311yO5opVk
Lesson 2
Soil is the loose, weathered material on
Earth’s surface in which plants can grow.
Bedrock is the solid layer of rock beneath
the soil.
Humus is a dark-colored substance that
forms as plant and animal remains decay.
The fertility of soil is a measure of how
well the soil supports plant growth.
Soil that is made up of about equal parts
of clay, sand, and silt is called loam.
The pH scale measures acidity.
How to Use pH test strips (2 facts)
http://www.youtube
.com/watch?v=xIz2Y
PBXuZU
A soil horizon is a layer of soil that differs
in color, texture, and composition from
the layers above or below it.
Mr. Parr Soil Layer Song (no facts)
http://www.youtube.com/
watch?v=gx2wVHeiTKE
The A horizon is made up of topsoil, a
crumbly dark brown soil that is a mixture
of humus, clay, and other minerals.
The B horizon, often called subsoil,
usually consists of clay and other particles
of rock, but little humus.
Decomposers are the organisms that
break the remains of dead organisms into
smaller pieces and digest them with
chemicals.
Mr. Parr – Decomposers Song (no facts)
http://www.youtube.c
om/watch?v=WLk9ib0OVA
Soil Stories – The Whole Story (Day 1 – 5 facts / Day 2 – 5 facts)
http://www.youtube.com/watch?v=Ego6LI-IjbY
Bill Nye the Science Guy 12:25 (5 facts)
http://www.youtube.com/watch?v=9Xv1DoqkARQ
Lesson 3
A natural resource is anything in the
environment that humans use.
Soil: Greatest Natural Resource Video
(No facts)
http://www.youtube.com/
watch?v=qajjl3esi5E
Soil conservation is the management of
soil to limit its destruction.
Science - Soil Erosion and Conservation Video
(3 facts)
http://www.youtube.com/
watch?v=QHyK2M8yiQE
In crop rotation, a farmer plants different
crops in a field each year.
Crop Rotation Made Simple: Video
(3 facts)
http://www.youtube
.com/watch?v=XeNA
6XdMoF8
What is crop rotation? Video
(No Facts)
http://www.youtube.com/
watch?v=O9YDlcKG4rA
In contour plowing, farmers plow their
fields along the curves of a slope instead
of in straight rows.
In conservation plowing, dead weeds and
stalks of the previous year’s crop are
plowed into the ground to help return soil
nutrients, retain moisture, and hold soil in
place.
Don’t call it dirt. (3 facts)
http://www.youtube.com/watch?v=LSRmFSKBypI
The Plant Doctor (2 facts)
http://www.youtube.com/watch?v=6NDUga9jJYg
Official San Francisco-Oakland Bay Bridge Construction Time-Lapse (no facts)
http://www.youtube.com/watch?v=GDUIYZKlknk