Which of the Following Is True About the World's Topsoil

Multiple Choice

Which of the following is true about the world's topsoil supply?

A) We now have more topsoil than at any point in recorded history.
B) Once topsoil is lost, it can only be replenished by the breakdown of more organic matter.
C) Modern industrial agricultural practices protect against the loss of topsoil.
D) All of the above are true.