Volcanic Ash - C
Cinders - A
Bombs - B
A control is a experimental variable that is kept constant or unchanged during an experiment. During a controlled experiment, the controlled variables are held constant to minimize or stabilize their effects on the subject, its unchanging state allows the relationship between the other variables being tested to be better understood.
The slab sinks faster and this pulls on the rest of the plate, continuing plate tectonics. Mantle convection creates the instability that allows plate tectonics to get going and helps a little, but it's not thought to be the main driving force
Only a Punnet square with one homogeneous dominant would produce 100% dominant trait offspring.
By dividing the amount of work done by the time it takes to do it; by dividing energy used in a given period by time.