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Answer:
<em>Different rocks have high, medium, and low melting points.</em>
Explanation:
There is a considerable range of melting temperatures for different compositions of magma. All the silicates are molten at about 1200°C (when a part of rock) and all are solid when cooled to about 600°C. Often the silicates are grouped as high, medium and low-melting point solids.
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Solids: wood, plastic, metals
Liquids: water (H2O), soap, juice, milk
Gases: Air, water vapour (H2O), carbon dioxide (CO2)
An element: gold, silver, aluminum, copper, nickel, iron, nitrogen in the air
A compound: salt (NaCl), carbon dioxide (CO2)
A homogenous mixture: air, water with sugar or salt dissolved in it
A heterogeneous mixture: orange juice with pulp, cereal in milk
Pure substances: diamond, water, salt, baking soda, sugar
10 molecules. Water molecules have 10 electrons and 10 protons. (8 from the oxygen atom and 1 from each of the 2 hydrogen atoms.)