what is the difference between the the types convegent boundries?

Question

how do the three types od convegent boundries differ from one another?

Answer 1

In the Theory of Plate Tectonics, large sections of the Earth are moving around, floating on the asthenosphere, kind of like Frisbees floating on hot mud. The plates that hold the continents are called "continental"; those at the bottom of the ocean are called "oceanic." Oceanic plates tend to be denser and heavier than continental plates, so when they meet, the oceanic plates moves under the continental plate in the process of subduction. The Plates all have boundaries (edges). Sometimes they move apart (divergent boundaries); sometimes they move together (convergent boundaries); sometimes they slide past each other (transform boundaries).There are several types of each kind of boundary. For Convergent Boundaries, the 3 types are: [1]oceanic/continental; [2] oceanic/oceanic; and [3] continental/continental.


"Convergent boundaries
The size of the Earth has not changed significantly since shortly after its formation 4.6 billion years ago. The Earth's unchanging size implies that the crust must be destroyed at about the same rate as it is being created. Such destruction of crust takes place along convergent boundaries where plates are moving toward each other, and sometimes one plate sinks (is subducted) under another. The location where sinking of a plate occurs is called a subduction zone.

The type of convergence -- slow "collision" -- that takes place between plates depends on the kind of lithosphere involved. Convergence can occur between an oceanic and a largely continental plate, or between two largely oceanic plates, or between two largely continental plates.

[1] Oceanic-continental convergence
If we could drain the Pacific Ocean, we would see a number of long narrow, curving trenches thousands of kilometers long and 8 to 10 km deep cutting into the ocean floor. Trenches are the deepest parts of the ocean floor and are created by subduction. Off the coast of South America, the oceanic Nazca Plate is being subducted under the South American Plate. In turn, the overriding South American Plate is being lifted up, creating the towering Andes mountains.

[2] Oceanic-oceanic convergence
As with oceanic-continental convergence, when two oceanic plates converge, one is usually subducted under the other, and in the process a trench is formed. The Marianas Trench marks where the Pacific Plate converges against the Philippine Plate. The Challenger Deep, at the southern end of the Marianas Trench, plunges deeper into the Earth's interior (nearly 11,000 m) than Mount Everest, the world's tallest mountain, rises above sea level (about 8,854 m).

[3] Continental-continental convergence
The Himalayan mountain range demonstrates one of the most visible consequences of plate tectonics. When two continents meet, neither is subducted because the continental rocks are relatively light and resist downward motion. Instead, the crust tends to buckle and be pushed upward. The collision of India into Asia 50 million years ago caused the Eurasian Plate to crumple up and override the Indian Plate. After the collision, the slow continuous convergence of the two plates over millions of years pushed up the Himalayas."