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LIST THE COLORS OBSERVED
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LIST WHAT COLORS WERE IN THE ROCK
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Are some of the colors shinier than others?
Make a list of each color and describe its lustre (shine). (Some good lustre words:metallic, matte, shiny, dull, pearly, and glassy.)
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Make a list of ten words that describe your rock.
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ACTIVITY
Here it will be very helpful to use the
Rocks
software as stated in the bibliography. In this program, Mr. Webster is the very creative author of this software.
In it you will have four chapters. (1) Properties of rocks. (2) Names of different rocks (includes streak testing, also to find out the various hardness of rocks. (3) Uses of rocks. (4) Test on rocks.
It is highly recommended that you use this piece of software. It really pulls together the whole rock unit very concisely.
EROSION AND SEDIMENTATION*
Right outside our school window, wind, water, heat, cold and gravity are forces that are constantly changing the earth. In the study of rocks, we become particularly aware of this.
Although a rock may seem to be something hard and indestructible, it is actually being changed constantly if it is on the surface of the earth. A rock is gradually crumbled (actually smashed) by the action of heat, cold, rain, snow, ice, and surface waters such as oceans. This eroding process is called WEATHERING.
In weathering, hot sun causes the surface of a rock to expand. Cold makes the surface contract. However, the surface does not expand and contract at the same rate all over, because of the different minerals in the rock.
Minerals react differently to heat and cold and expand and contract at different rates. The result is the rock begins to crack. In time, fragments of rock are broken off and washed away becoming smaller and smaller (we will experiment with this process at a later date) as they travel. Eventually they are deposited as layers of silt, sand and earth. And the whole process of rock formation begins again.
(Use with “Rock Cycle” sheet.)
(Use with “Rock Study” sheet.)
