Passage: The Journey of a RiverRivers are vital to our ecosystem and play a crucial role in the environment. They begin assmall streams in the mountains, where rainwater and melting snow collect. As these streams flowdown the mountains, they gather more water from tributaries, which are smaller streams that feedinto the main river.As rivers travel, they carve out valleys and canyons, shaping the landscape. They providehabitats for various wildlife, including fish, birds, and plants. Rivers also serve as a source of waterfor drinking, agriculture, and industry.However, rivers face many challenges. Pollution from factories and agricultural runoff canharm aquatic life and make the water unsafe for human use. Additionally, climate change affectsriver flow and temperature, impacting the ecosystems that depend on them.Understanding the journey of a river helps us appreciate its importance and the need to protect thesenatural resources.Questions:1. What are the two main sources of water that contribute to the formation of rivers?a) Rainwater and melting snowb) Lakes and oceansc) Groundwater and glaciers2. How do rivers shape the landscape?a) By flooding the surrounding areasb) By carving out valleys and canyonsc) By creating lakes3. List two ways rivers are beneficial to humans.4. What are some challenges that rivers face according to the passage?5. Why is it important to understand the journey of a river?6. In your own words, explain how pollution can affect river ecosystems.