Question

1. the transition between the continents and the ocean is known as ____.a. continental shelfb. oceanic crustc. continental sloped. continental margin17. both seafloor spreading and rift valleys occur at a __ boundary.a. convergentb. divergentc. transformd. all of the above18. continent to continent plate collisions occur on ____ boundaries and can form mountains.a. convergentb. divergentc. transformd. all of the above

Explanation:

1. For Q16: The continental margin is the zone that forms the transition between continental crust and oceanic crust, encompassing the continental shelf, slope, and rise.
2. For Q17: Seafloor spreading occurs at divergent boundaries where tectonic plates move apart, and rift valleys are also formed by this divergent motion.
3. For Q18: When two continental plates collide, it happens at convergent boundaries, leading to mountain formation as neither plate subducts easily.

Answer:

1. D. continental margin
2. B. divergent
3. A. convergent