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Floating in different liquids
Obtain a tall, slender glass jar, test tube or bottle, and the following liquids: mercury, carbon tetrachloride, water and kerosene. You will also require a small iron or steel ball such as a ball bearing, or iron nut or bolt; a small piece of ebony or some other wood that sinks in water; a piece of paraffin wax; and a piece of cork. First pour some mercury into the glass jar, then some carbon tetra- chloride, some water and some kerosene.
REQUIREMENTS Chemicals The following materials are common for the whole batch of students at the Study Centre, since this is a demonstration exercise. Acetone (or ethyl meth
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Why does a glacier move? It moves due to the huge pressure of the ice and snow lowers the freezing point of its lower layers, causing them to melt.
QUESTION (A) Describe, with diagram, the structure of a neuron (B) ‘Neurons are specialized cells that carry messages.' Describe how messages are carried by neurons (C) F
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