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What are the three main classifications of rocks on Earth and how are they formed?
Elbow
The joint connecting the forearm to the upper arm, allowing for the bending and extending of the arm.
Knee
A hinge joint that connects the thigh bone (femur) to the shin bone (tibia).
Shoulder
The region of the body where the upper arm bone (humerus), shoulder blade (scapula), and collarbone (clavicle) meet.
Diarthrosis
A type of joint that allows for free movement between the bones it connects, commonly known as a synovial joint.
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