In mid-western North America, the southern boundary of the north polar ice cap during past ice ages is marked by these two rivers Group of answer choices a. the Missouri and North Platte Rivers. b. the Arkansas and Ohio Rivers. c. The North Platte and Ohio Rivers. d. the Missouri and Ohio Rivers.

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. 

Check -it can you examine advantages and drawbacks to possible solutions.check-it can you consider options to solve a problem.check-it can you persuade an audience to support a proposal.check-it can you identify the cause of a problem.