Question

what happens when two continental plates meet at a convergent boundary according to plate tectonics? they push against each other to form deep - ocean trenches. one slides under the other to form magma. they push against each other to form folded mountain ranges. one slides under the other to form new mantle.

Explanation:

1. Analyze the first option: Deep - ocean trenches are formed at convergent boundaries where an oceanic plate and a continental plate (or two oceanic plates) meet, not two continental plates. So this option is incorrect.
2. Analyze the second option: Subduction (one plate sliding under another) occurs when an oceanic plate and a continental plate meet (because oceanic plates are denser). Continental plates are less dense, so subduction does not occur between two continental plates, and thus magma formation in this way is not typical for two continental plates. This option is incorrect.
3. Analyze the third option: When two continental plates meet at a convergent boundary, they have similar densities, so they push against each other. This compression leads to the folding of the crust and the formation of folded mountain ranges (e.g., the Himalayas formed by the collision of the Indian and Eurasian continental plates). This option is correct.
4. Analyze the fourth option: Subduction does not occur between two continental plates, and the formation of new mantle is not a result of two continental plates meeting at a convergent boundary. This option is incorrect.

Answer:

C. They push against each other to form folded mountain ranges.