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What does chemical formula show?

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How compounds are formed?

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Name the major dissolved salts in ocean water

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How many are the parts of an ecosystem? Name

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A chlorine atom has 17 protons and 18 neutrons. What is its mass number?What is its atomic number?

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Why is the most of earth's water salty?

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What is ocean water?

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Write the characteristics of rain-forest habitat and give relevant examples of this habitat?

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What is meant by drought?

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Write down the features of desert habitat.

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Give an example of law of constant composition.

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. Define pollutants?

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How temperature cause changes in a habitat?

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Write down the physical states of water ?

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How water is used in industries?

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How natural disasters can bring changes in habitat?

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What is an ion? How ions are formed?

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Compare the different kinds of habitat?

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What are sources of water? explain.

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How water is used as a source of energy?

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