Plates include both oceanic crust and continental crust. Stable subduction zones involve the oceanic lithosphere of one plate sliding beneath the continental or oceanic lithosphere of another plate due to the higher density of the oceanic lithosphere. That is, the subducted lithosphere is always oceanic while the overriding lithosphere may or may not be oceanic.
The primary causes of arthritis include viruses, bacterial infections, injuries, autoimmune disorders, and old age. There are over one hundred different types of arthritis, and each of these types can occur as a result of a different cause.Arthritis can affect large joints and small joints.The pain might remain located to one joint, or multiple areas of the body can develop symptoms.here are over one hundred different types of arthritis, and each of these types can occur as a result of a different cause. Arthritis can affect large joints and small joints. The pain might remain located to one joint, or multiple areas of the body can develop symptoms.
Introduction. Rheumatoid arthritis (RA) is an autoimmune disease where the body's immune system mistakenly attacks the synovium, a thin membrane that lines the joints. It causes chronic inflammation that leads to pain, swelling, and stiffness.Eventually, bones and joints can be damaged, leading to disability.ymptoms of RA include: 1  Morning stiffness -- waking up with stiff joints, often the wrists and base of the fingers, ankles, balls of the feet, elbows, or knees. 2  Joint pain with warmth, swelling, tenderness, and stiffness of the joint after resting. 3  Limited range of motion in the affected joints. 4  Fatigue.