Isaac wants to make s'mores. he holds a marshmallow on a metal skewer over a fire. a few seconds later, the marshmallow is cooked and the skewer feels warm. what most likely happened? ]
the fire heated the surrounding air, which cooked the marshmallow.
the heat generated from the marshmallow flowed in the form of thermal energy to the skewer and fire.
the heat from the skewer cooked the marshmallow.
thermal energy in the form of heat moved from the fire to the skewer and marshmallow.

Answer;

hot magma rises and pushes up toward the lithosphere, and as it cools it cycles back down toward the core to be heated again.

explanation; convection currents are the circular pathways taken by a fluid that enhances heat transfer by the process known as convection which occurs in fluids.convection currents transfer heat from one place to another by mass motion of a fluid. earth mantle is in a semi-liquid state and behaves like any other fluid, rising up from the bottom of the mantle after becoming hotter and less dense from heat of the earth's core, as the rock loses heat into the earth's crust it becomes cooler and more dense, then sinking back down to the core, then repeating the cycle.

They coasters are in tear-drop form because of physics. if the ride was in a complete circle, how would the coaster get into the loop, let alone get out of the loop? also, the reason why most coasters are in tear-drop form is because of acceleration. the steeper the turn, the faster the ride.