The grasslands of the Midwestern united states have been grazed and farmed so that almost no grasslands remain with their original species of plants and animals. How could people in the Midwest determine what kind of natural ecosystem they are in? Check yearly average rainfall
Look around, since even a changed ecosystem is still an ecosystem.
Look in history books to determine what type of organisms lived there before.
Check yearly average temperatures and see what types of plants and animals live in those temperatures.

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. 

Answeris associated with sunny,dry weather;