A. Layer C is the right answer out of all the choices
A boiling pot of water (the water travels in a current throughout the pot), a hot air balloon (hot air rises, making the balloon rise) , and cup of a steaming, hot liquid (hot air rises, creating steam) are all situations where convection occurs.
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Answer:
Counterclockwise
Explanation:
We need to calculate the clocwkise and the counterclockwise torque.
The clockwise torque is the one generated by the child sitting on the right. This torque is given by:

where
is the force exerted by the child (his weight)
d = 1.8 m is the distance from the pivot point
So, the clockwise torque is

The counterclockwise torque is the one generated by the adult pushing on the left, and it is given by

where
F = 151 N is the force applied
d = 3.0 m is the distance from the pivot
Substituting,

So, the net torque is

And since the counterclockwise momentum is greater than the clockwise one, the teeter-totter will rotate counterclockwise.
If the metal plate that has a circular hole with radius R. And if we raise the temperature of this plate the radius of the hole will increase.