Process of mixing soil by fauna and flora is called__________________?

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Father of agricultural chemistry is___________________?

A. Vonliebig B. Neil Brady C. Neuron D. J. jones...

Large pieces of erupted magma are called_____________________?

A. Volcanic ash B. Volcanic block C. Dike D. Sill...

Age of Earth is_____________________?

A. 4.5 billion years B. 4 billion years C. 1 billion years D. 6 billion years...

Mean annual precipitation for tundra region is ____________________?

A. 70-80 cm B. 150-70 cm C. 0-50 cm D. None of the above...

Algal photosynthesis increases pH of water and releases___________________?

A. O2 B. CO2 C. SO3 D. All the above...