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Rock Notes
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Page Intentionally Left Blank
This book was developed in collaboration with Region 4 Education Service Center, Houston, Texas.
Rock Notes
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Copyright © Texas Education Agency, 2015. The following materials are copyrighted © and trademarked ™ as the property of the Texas Education Agency and may not be reproduced without the express written permission of the Texas Education Agency, except under the following conditions:
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For more information, contact: Office of Copyrights, Trademarks, License Agreements, and Royalties. Texas Education Agency. 1701 N. Congress Ave., Austin, TX 78701-1494; phone 512-463-9041; e-mail [email protected].
1919
I am going to save my descriptions in my notebook until we describe rocks in class. I cannot wait!
It has coarse grains. The grains are angular shaped.It is light colored. It has several different colors.It is mostly shiny.
gcolors.It is mostly shiny.
It has fine
grains. I ca
nnot see the
grains
with a hand
lens.
I cannot see
the grain s
hape.
It is light co
lored. It look
s a little pea
chy.
It has a dull
luster.
Science Notebook
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1818
It has coarse grains. The grains are angular shaped.It is light colored. It has several different colors.It is mostly shiny.
33
At the beginning of the school year, I found a science notebook in my desk. The notebook was obviously left behind by whoever sat in my desk last year. It was full of notes and illustrations!
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4
I like to look in the notebook to see what we will learn next. My teacher said we will study rocks next week, so I thought I would check the notebook.
Cobble 6.4–25.6 cm
pebble
cobble
Pebble 0.2–6.4 cm
11817161514131211109876543210
1717
I am going to practice being a geologist and describe a few rocks. A geologist describes grain size and grain shape. They also describe color and luster, so I will, too.
1
It has fine grains. I cannot see the grains with a hand lens.I cannot see the grain shape.It is light colored. It looks a little peachy.It has a dull luster.
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1616
I have never heard the word luster, but I can tell if something is shiny or dull. Now I can describe these rocks I found.
Luster
5
I remember exploring rocks in kindergarten. A grain of sand is a tiny piece of rock. Pebbles are small rocks. Cobbles are medium-size rocks. Boulders are big rocks.
Boulder Greater than 25.6 cm
3837363534333231302928272625242322
boulder
22212019
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6
I like rocks, but I don’t know much about them.
rocks
texture
color luster
medium coarse
round
angularfine
light
dark
grain shape
size
sand pebblecobble
boulder
grain size
15
Luster November 15
Geologists use the word luster to describe the way light is reflected off the surface of a rock.
Gneiss is mostly dull. I think this rock is neat because it looks like a sandwich.
Obsidian is black and has a shiny, glassy luster.
Words that describe luster: dull and shiny
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14
Color
Light Medium Dark
Geologists use words like red, brown, or black to describe the color of rocks. They also use the words light, medium, and dark to describe the color of rocks. You may notice that many rocks have several colors. Use the color you see the most to describe a rock.
November 15
This limestone is tan and light colored.
This rock is brown and medium colored.
This basalt is black and dark colored.
7
It looks like we will observe and describe rocks and learn some new words.
Geo = Earth ology = study of ologist = scientist who studies
November 12
Geologist: a scientist who studies EarthA geologist observes and describes rocks.I can observe and describe rocks.
It is black.It has white spots.It is smooth and lumpy.It is shiny.
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8
Rocks have grains.A grain is the smallest part that makes up a rock. Different rocks have different-sized grains.
You use your sense of touch to identify and describe the texture of a rock. Geologists observe the grains of a rock to describe its texture.
November 13
1313
I guess this smooth rock would be described as a fine-grain rock with round grains.
fine grains
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1212
I would say this rock is rough, and a geologist would describe it as a coarse-grain rock with angular grains.
coarse grains
9
Words that describe grain size: coarse, medium, fine
Texture: grain sizeGeologists use the word texture to describe the way the grains are arranged in a rock and the size of the grains compared to one another.
November 13
I use words like rough and smooth to describe texture, but geologists use different words.
Coarse-grain rocks, like granite, may feel rough to the touch, and you can see the grains with just your eyes.
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10
Texture: grain size November 14
You need a hand lens to see medium grains because they are smaller than coarse grains.
You need a microscope to see fine grains in rocks like marble because they are tiny.
gneiss (sounds like “nice”)
11
Texture: grain shape November 14
Geologists use the words round and angular to describe the texture, or shape, of the grains in a rock.
Conglomerate has round grains. Conglomerate has round grains. Breccia has angular grains.
Round grains Angular grains
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