The practice of leaving crop residue on the field between ...

[stevenposner]

The practice of leaving crop residue on the field between plantings to help prevent soil erosion is known as
 
  A) slash and burn agriculture.
  B) swidden.
  C) shifting cultivation.
  D) no-till agriculture.

Question 2

Mafic igneous rock, such as gabbro and basalt,
 
  A) are derived from magnesium and iron.
  B) have light coloration.
  C) are high in silicate minerals.
  D) have a low melting temperature.

[jgranad15]

Answer to Question 1

D

Answer to Question 2

A

[stevenposner]

Thanks for the timely response, appreciate it

[connor417]

Gracias!