4. What features are commonly found along convergent boundaries? a. Mountains and trenches b. Rift valleys and mid-ocean ridges c. Volcanoes and geysers d. Lakes and rivers

The correct answer is: **a. Mountains and trenches** ### **Explanation:** **Convergent boundaries** are regions where two tectonic plates move toward each other and collide. This interaction can result in several geological features: 1. **Mountains:** When two continental plates converge, neither is easily subducted, leading to the crumpling and uplift of the Earth's crust, forming extensive mountain ranges. An example is the **Himalayas**, formed by the collision of the Indian and Eurasian plates. 2. **Trenches:** When an oceanic plate converges with either another oceanic plate or a continental plate, the denser oceanic plate is often subducted beneath the other. This process creates deep oceanic trenches. A notable example is the **Mariana Trench** in the Pacific Ocean. ### **Why the Other Options Are Incorrect:** - **b. Rift valleys and mid-ocean ridges:** These features are associated with **divergent boundaries**, where tectonic plates move apart from each other. - **c. Volcanoes and geysers:** While **volcanoes** are indeed common at convergent boundaries due to subduction-related melting, **geysers** are more related to geothermal activity and are not specifically indicative of plate boundaries. - **d. Lakes and rivers:** These are surface water features and are not directly related to tectonic plate interactions at convergent boundaries. ### **Summary:** Mountains and trenches are hallmark features of convergent plate boundaries, resulting from the collision and subduction of tectonic plates.