World Geography
The ozone layer at high altitude contains

only ozone (O3)
atomic oxygen (O) and ordinary oxygen (O2)
only ordinary oxygen (O2)
mixture of atomic oxygen (O), ordinary oxygen (O2) and Ozone (O3)

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World Geography
What type of wood is especially suitable for making pulp and paper?

Hardwood of the tropical forests
Softwood of the temperate forests
Softwood of the tropical forests
Hardwood of the temperate forests

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