Is lava intrusion an example of mechanical weathering?

No, lava intrusion is not an example of mechanical weathering; it is a geological process related to igneous rock formation. Mechanical weathering involves the physical breakdown of rocks into smaller pieces without changing their chemical composition, often through processes like freeze-thaw cycles or abrasion. In contrast, lava intrusion occurs when molten rock from beneath the Earth's surface forces its way into existing rock layers, leading to the formation of new igneous rock rather than the weathering of existing materials.