A muscle that crosses on the medial side of a joint produces what movement?

Adduction movement.

Explanation: Adduction movement is the movement of a body part toward the midline the body. Adduction movement occur when a muscle crosses on the medial side of a joint.

b is the best answer for this question.

volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).