In the healthy environment of a sustainable soil, A) the ...

[kfurse]

In the healthy environment of a sustainable soil,
 
  A) the levels of humus steadily decline, but the aeration increases.
  B) sandy or silty soils are steadily converted to clay soils.
  C) abundant populations of bacteria are steadily replaced by mycorrhizae.
  D) the humus-forming processes of topsoil is renewed by the addition of detritus and humus.

Question 2

Match the sphere of the Earth with the correct definition.
 
  A) Gaseous envelope around the planet
  B) The solid Earth
  C) Water portion of the planet
  D) All life on the planet
 
  1) Hydrosphere
  2) Biosphere
  3) Atmosphere
  4) Geosphere

[ricroger]

Answer to Question 1

D

Answer to Question 2

Answers: 1) C 2) D 3) A 4) B

[kfurse]

Gracias!

[jordangronback]

Wow, this really help