Answer:
rotor
Explanation:
The part of the motor being pointed to is called the <em>rotor</em>.
The answer is A-Gravity. Why? This is because B and C are examples of chemical weathering and not mechanical. Although choice D may seem viable lava intrusion is not a direct cause of mechanical weathering although lava pushing upward may help in aiding mechanical weathering it would not be considered a big enough cause, thus gravity is the correct answer.
In this case a double displacement reaction will take place.
A i hope that helped i love you guys have a great day
And merry chrismas