Transcript Beach Treasures from Japan

Beach Treasures from
Japan
Rocks and Sand Dollars
Metamorphic Rocks
• Method: Beach combing fieldtrip in Japan
• Collection: Slate and Green Slate (see picture on
display board)
• Interpretation: Metamorphic rock forms from pre-existing
rock exposed to high temperatures and pressures which
causes them to change. Metamorphic rock forms part
of the earth’s crust. It contains crystals and can be
layered. Slate is a hardened form of shale (clay) and
resists harsh weather and repels water. It is used for
student writing tablets. Green slate obtains its green
color from chlorite. It’s formed from many different types
of rock such as quartz, feldspar and mica.
Sedimentary Rocks
• Method: Beach combing fieldtrip, Japan
• Collection: Magnified Grains and Chert
• Interpretation: Magnified Grains were
once big rocks that are broken down by
erosion into small, smooth stones; Chert is
like quartz which contains silicon dioxide
and other elements, and is green and
white in color. (See display board)
Igneous Rocks
• Method: Beach combing fieldtrip in Japan and a purchased science
kit
• Collection: Pumice, Andesite, Banded Rhyolite, Welded Tuff,
Cinders, Geyserite, Obsidian, Basalt. (See display board)
• Interpretation: Igneous rock is formed by great heat or lava that
crystallizes. It contains silicon, oxygen and other elements.
Pumice is made from airy lava that dries quickly and forms a light
rock with holes. Andesite is a fine-grained rock formed from lava in
subduction zones where lava is thrust upward when the earth’s
plates collide. Rhyolite is formed from many other types of rocks
called quartz, feldspar, mica and glass. It is a fine or very fine rock.
Tuff is andesite-composition ash which consolidates into welded
tuff. Cinders is a reddish color and has the texture of pumice and
floats in water. Geyserite is a whitish gray rock that is formed by
geysers. Obsidian is a black glossy looking rock. Its main
component is glass. Ancient people used it for knives or arrow
heads. Basalt is a dark, fine grained rock which contains crystals
that are not easy to see. The ocean floor is made mostly of basalt.
Sand Dollars
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Method: Beach combing fieldtrip Mutsu Bay, Japan
Collection: Western Sand Dollars
Interpretation: Scientific name: Dendraster excentricus
The familiar sand dollar is actually the exoskeleton called a test. It is
usually a white, round disk with a five point star design on the top and can
be found washed up on the beach.
Their mouths are a hole on the bottom center of the exoskeleton. They feed
on plants and animals by catching them with their five teeth-like sections.
When they’re alive their exoskeletons are covered with fuzzy spines which
helps them move.
In still waters, they stand up on their sides and are halfway buried in the
sand.
In rough waters, the sand dollars will try to bury themselves in the sand to
avoid being tossed around.
They are related to the sea urchin and the sea star.
There are many types of sand dollars in all the oceans and examples of
these are listed on the display board.
Sources of Information
• The Nature Company Guides Rocks and Fossils
by Arthur B. Busbey III, Robert R. Coenraads,
Paul Willis, David Roots.
• Rocks and Minerals by Chris Pellant.
• Investigating God’s World, 3rd edition, A Beka
Book Science Series.
• www.mindat.org
• www.seashells.org
• www.baynature.com
• www.answers.com
Display Board and Close Ups
Display Board Con’t…
Collection Labels
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Sedimentary Rocks
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Metamorphic Rocks
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What: Magnified Grains
Texture: Smooth
Size: 1 1\2in.-2in.
Where: Shipwreck beach, Mustu
Bay, Japan
When: Summer of 2006
Collected by: Jacob Urbano
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What: Slate
Texture: rough
Size: 4 1\2 in.
Where: Misawa Air Base, Japan
When: April 17, 2007
Collected by: Jacob Urbano
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What: Green Slate
Texture: rough
Color: greenish
Size: 6 1\2 in.
Where: Misawa Air Base, Japan
When: April 23, 2007
Collected by: Jacob Urbano
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What: Chert.
Texture: rough; fine grained
Color: white, greenish, grayish
Size: 6 1\2 in.
Where: Misawa Air Base, Japan
When: April 23, 2007
Collected by: Jacob Urbano
Collection Labels
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Igneous Rocks
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What: Pumice
Texture: very rough; airy and light
Color: whitish, grayish
Size: 1-2 in.
Where: Miss Veedol Beach, Misawa, Japan
When: April 17, 2007
Collected by: Jacob Urbano
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What: Obsidian
Texture: Smooth and glossy
Size: 2 in.
Color: shiny black
Where: My science Kit
When: April 19, 2007.
Collected by: Jacob Urbano
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What: Rhyolite
Texture: Coarse grained
Color: Brown, orange, white, black mixed
Size: 2 1\4 in.
Where: My science kit
When: April 23, 2007
Collected by: Jacob Urbano
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What: Cinders
Texture: Coarse
Color: Reddish, brown
Size: 1 3\4 in.
Where: My science kit
When: April 23, 2007
Collected by: Jacob Urbano
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What: Basalt
Texture: Bumpy
Color: Blackish, grayish
Size: 1 3\4 in.
Where: My science kit
When: April 23, 2007.
Collected by: Jacob Urbano
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What: Geyserite
Texture: Fine Grained
Color: Whitish grayish
Size: 1 1/2 inches
Where: My science kit
When: April 23, 2007
Collected by: Jacob Urbano
Collection Labels
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What: Welded Tuff
Texture: Medium grained
Color: pink, purple, white mixed
Size: 2 1\4 in.
Where: My science kit
When: April 23, 2007
Collected by: Jacob Urbano
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What: Andesite
Texture: Fine grained
Color: Black
Size: 2 in.
Where: My science kit
When: April 23, 2007
Collected by: Jacob Urbano
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Shells
What: Sand Dollars
Texture: fine grained
Color: White and gray
Size: 2 ½ inches diameter
Where: Shipwreck Beach, Mutsu
Bay, Japan
When: Summer 2006
Collected by: Jacob Urbano
Acknowledgements
I want to thank my mom and my older sister
for helping and encouraging me with this
project.