According to the plate tectonics theory, what provides the energy for the constructive forces on earth’s surface?
a.
earth’s internal heat
b.
earth’s movement through space
c.
the sun
d.
gravity

A.  Earth’s internal heat

Explanation:

The earth internal heat is what drives the plate on the earth in motion and this heat energy comes to from the core of the earth and this makes the base of the plate tectonic theory as plates are dynamically active and the forces that provide energy to the earth surface are held responsible for the earth internal radioactive decay of the elements.  This also related to the planet's heat budget and power the most of the geologic process that takes place on earth. This heat index is measured from the heat that comes out from the earth's core to the mantel and to the crust of the planet.

Ibelieve it's the pacific islands 

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.