Match the landform in column 1 with the description in column 2. Niagara Falls
?
A major source of
hydroelectric power
Mount McKinley
1?
A volcano that grew out of
a cornfield in 1943
Paricutin
?
A natural barrier to settling
in the West

Answer feldspar,quartz,mica and amphibole;

The answer is c, i, iii, and iv. this is because farming and mining deal with harvesting raw materials, construction work falls under manufacturing, and piloting a plane is a service. ii is wrong because making bread is using  raw materials to produce goods, which would fall under the secondary sector, not primary.

Sonar is an application of the doppler effect used by submarines.  this test was on k12.