What factor is essential to Joule's paddle wheel demonstration? A Paddles that have greater kinetic energy than the masses' gravitational potential energy
B Masses that have an initial temperature that is cooler than the water
C Water temperature sufficient to move the paddles
D Friction between the water and the paddles

Julia would be observing a. static electricity was caused by her sweater rubbing against her shirt and transferring electrons. she didn't touch anything metal, so that would cancel out b.she most likely didn't rub her sweater against her hair either, so that cancels out c.she also didn't scoot across the carpet while trying to take her sweater off, that cancels out d.so that leaves a.a. is correct.

The next element is345640

Magma  is composed of molten rock and is  stored  in the earth's crust. lava is  magma  that reaches the surface of our planet through a volcano vent.

What does the start look like