A mountain climber with a mass M ponders the idea of attaching a helium-filled balloon to himself to reduce his weight, so his effective weight will be P*Mg, where P is a numerical factor in the range of 0.0 .. 1.0: When P = 0.0, the climber will be just barely floating above the surface When P = 1.0, there is no lifting at all Density of the Air = 1.21 kg/m3 Density of Helium = 0.178 kg/m3 If the balloon is perfectly spherical, calculate it's diameter provided the following values: M = 77 kg P = 0.2 .

This did i unseated, sorry

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.