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1
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cutting down of trees.
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2
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the layer that protects earth from UV rays
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3
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the environment with biotic and abiotic components.
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4
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green plants are also known as ____________.
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5
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naturally produced food.
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6
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Green house gas.
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8
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species which do not exist.
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9
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abundantly present element in the universe
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1
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erosion of topsoil which can lead to ____________ (it forms a desert due to barren rocky sand on top)
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7
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the gas needed for our survival.
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