Question

which correctly lists three water sources that contribute to a river system? groundwater, ponds, streams lakes, rivers, ponds rivers, streams, watersheds streams, lakes, oceans

Explanation:

• A river system includes various water sources. Groundwater can seep into rivers, ponds can contribute water (e.g., if a river flows through or near a pond), and streams are smaller watercourses that often feed into rivers.
• Lakes, rivers, and ponds: A river is the main part of the river system, so listing it as a "source" is incorrect in this context as we are looking for sources that contribute to the river system rather than the river itself being a source in this sense.
• Rivers, streams, watersheds: A watershed is an area of land that drains into a body of water, not a water source.
• Streams, lakes, oceans: Oceans are not a typical source that directly contributes to a river system (rivers usually flow into oceans, not the other way around).

Answer:

groundwater, ponds, streams