1: Which is not a mechanism for plate movement A. slab pull

B. ridget push

C. convection

D. mid-ocean ridget

2:which agriculture technique is the least economical sustainable

A. cultivating only one species of plant in each farm

B. using reduced or ni tilling of soil

C. using manure to fertilize soil

D. rotating different crops or livestock on a ply of land

3: how can agriculture negatively impact the environment
A. it can increase the amount of flooding

B. It releases carbon dioxide into the atmosphere

C. Agriculture reduces the amount of oxygen in the atmosphere

D. Farmers use fertilizers and pesticides which can contaminate rivers and streams