IN-CLASS PRESENTATIONS
Gregg Wilkerson has several lessons designed for elementary scho=
ol
children and also for Jr. and Sr. High School Students.
ROCKS AND MIN=
ERAL
KITS
Students make rock and mineral kits using an egg carto=
n.
Gregg gives out 12 free specimens and describes them. The goal of this less=
on
is to teach students about the differences between rocks and minerals, and =
to
appreciate the variety of rocks and minerals that are found in California.
Gregg also describes the economic uses of these rocks and minerals.
![3Dazurite.jpg](3D"INCLASSPRESENATIONS_files/image001.jpg")
EROSION AND
SEDIMENTATION
The Ero=
sion and
Sedimentation demonstration teaches about the erosive power of water and the
way water redistributes sediments according to particle size. Five buckets
filled with different sizes of sediments are placed near and inclined sluice
box. Students take cups of the different sized sedimentary materials (grave=
l,
sand, clay) and build a mountain. Gregg explains that this is a model of a
mountain, and it contains large and small particles. Then a hose is turned =
on
over the “mountain” as rain erodes away the mountain. The water=
is
turned off, and then the distribution of the sediments is analyzed. The wat=
er
in the lower part of the inclined sluice box has formed the “sea̶=
1; which
is full of mud.
Large particles stay near the “mountain” a=
nd the
smaller particles have moved along the “river bed” to the
“sea”. Gravel is =
near
the “mountain”, sand is in the “river” between the
mountain and the “sea”, and the mud is in the “sea”=
.
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