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Definition of a rock and the difference between a rock and a mineral ?
A rock is a mixture of one or more minerals. There are many kinds of rocks, and we will learn about them in following lessons. At this point, it is sufficient to know that a rock is a very general term that applies to most any hard, naturally occurring mineral deposit found at the surface of our planet. Rocks are usually a mixture of minerals, either melted or compressed together by forces within the Earth.
A common and excellent example of a typical rock is granite. Granite is a mixture of silica and feldspar minerals. You can easily see, with the naked eye, the different mineral deposits that make up this rock. A picture of granite is available in the multimedia enhancement of this lesson.
Air Pollution Air pollution is one of the major problems created by modern man. It is estimated that about 100 million tons of waste are poured into our atmosphere each y
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How to make a receiver for vacuum experiments Secure a large jar with an air-tight screw cap, like as a fruit jar. Drill a hole by the top and have a short metal tube soldered
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which nutrient contains carbon, hydrogen, oxygen, nitrogen and sometimes sulphur and phosphorus?
Miller's Experiment The above theory could be tested by recreating in the laboratory on a small scale, the conditions which must have existed when life originated on the
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