form where a river ends and becomes a body of water such as a lake or an ocean

       Deltas          form where a river ends and becomes a body of water such as a lake or an ocean

Explanation:

Rivers flow continually from high points (in the mountains) until they reach a broad, extensive body of water at low levels (normally 0 meters altitude), like a lake or an ocean ,where they empty their water and sediments.

The landform created is named delta.

Deltas are regions flooded with many streams of water that find their way to the lake or ocean.

Some examples of deltas are The Mississippi Delta and the Nile Delta.

You can see attached a picture of a delta taken from the internet.

so what is the problem with your lab report and whats the subject of the lab report? i will you