Question

which statement explains one way that lakes form?
○ lava flows block a river.
○ streams flow into shallow areas.
○ groundwater feeds into low-lying areas.
○ grassy wetlands get covered by a stream.

Explanation:

When lava flows from a volcano solidify, it can create a natural dam that blocks a river's path. The trapped water behind this dam accumulates to form a lake, which is a recognized geologic process for lake formation. The other options do not describe a direct, distinct mechanism of lake creation: streams flowing into shallow areas, groundwater feeding low-lying areas, and streams covering wetlands do not independently form a lake in the definitive way a lava dam does.

Answer:

A. Lava flows block a river.