Q. In tectonic cycle, creation and destruction of solid outer layer, known as

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Q. Which nutrient does not have a gaseous phase on earth?

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Q. Releasing fixed nitrogen back to molecular nitrogen is known as

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Q. Plates move away from each other, in the

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Q. What chemical reaction takes place when chemicals from rocks dissolved in water ?

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Q. How much thicker is lithosphere ?

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Q. Where does divergent plate boundary occur?

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Q. What does 'plate' form ?

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Q. Himalaya is formed by

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Q. What does free nitrogen make 80% of earth ?

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Q. In ocean, carbon is usually in form of:

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Q. What is involved in manufacturing of protein and DNA ?

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Q. Material produced by weathering accumulates in

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Q. Which two gases are most responsible for greenhouse effect ?

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Q. Contamination of soil system by considerable quantities of chemicals and substance is known as

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Q. In oceans, food web is involved in more species, than

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Q. What trophic level would a carnivore occupy ?

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Q. Which teeth helps human in tearing flesh ?

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Q. Individual food chain interconnected to form a

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Q. Utilized energy by herbivores, known as

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