Answer:
A delta is the triangular deposit at the end of a river (where it empties into another body of water). As the river is flowing, it carries sediment and water downstream and deposits it. The delta itself is formed by the sediment building up into a landform.
Answer:
A Joint.
Explanation: I took the quiz.
1. Red giant
2. Main sequence
3. Protostar
4. White dwarf
5. Planetary nebula