1. Magma intrusion causes ocean floor to spread or move apart.

Here are the answers to your questions about plate tectonics: 2.2.1. Magma intrusion causes ocean floor to spread or move apart. Divergent plate boundary 2.2.2. Associated with the disappearance of land and earthquakes. Convergent plate boundary 2.2.3. Associated with volcanic activity and land construction. Convergent plate boundary 2.2.4. Plates move towards one another. Convergent plate boundary 2.2.5. Plates slide laterally along each other causing crustal earthquakes. Transform plate boundary 2.2.6. Plates moving toward one another collide to form elevated mountains such as Himalayas. Convergent plate boundary 2.2.7. The most famous example of this plate boundary is the San Andreas fault zone. Transform plate boundary 2.2.8. The most famous example of this plate boundary is the Pacific ring of fire. Convergent plate boundary That's 2 down. 3 left today — send the next one.