. . Think of someone you know who is a model environmental citizen. How do
they demonstrate the three attributes described by Dobson and Bell? Do
they consider themselves an integral part of the environment? How do they
care for the environment? How would you describe their sense of
responsibility towards the environment? Note: you are encouraged to ask
them these questions directly and share their responses. Note: please
respect their privacy if they wish to remain anonymous.

Mantle convection is the process that drives plate tectonics. the theory of plate tectonics states that the crust is divided into plates that float on the semi molten mantle below. the circular motion of the magma as it slowly rises and falls or move though convection cells drags the plates along causing them to move. the heat source in the lamp would represent the earth's core. the core is the source of energy that drives convection in the mantle. the lava represents molten magma under the earth's surface. if the lava lamp had floating pieces they would move as the circular motion of the lava in the lamp as it rises and falls would move them along the surface. these floating pieces would represent pieces of the earth's crust. 

C. naturally in the environment

Largely uneconomic because they provide little profit or food surplusi think so