Chapter 2 PowerPoint Notes and Videos

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)
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
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
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)
Bill Nye the Science Guy (5 facts)
Mr. Parr Weathering and Erosion Song (No facts)
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)
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)
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
Mr. Parr – Decomposers Song (no facts)
Soil Stories – The Whole Story (Day 1 – 5 facts / Day 2 – 5 facts)
Bill Nye the Science Guy 12:25 (5 facts)
Lesson 3
A natural resource is anything in the
environment that humans use.
Soil: Greatest Natural Resource Video
(No facts)
Soil conservation is the management of
soil to limit its destruction.
Science - Soil Erosion and Conservation Video
(3 facts)
In crop rotation, a farmer plants different
crops in a field each year.
Crop Rotation Made Simple: Video
(3 facts)
What is crop rotation? Video
(No Facts)
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
Don’t call it dirt. (3 facts)
The Plant Doctor (2 facts)
Official San Francisco-Oakland Bay Bridge Construction Time-Lapse (no facts)

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