Take a moment to think about how the Colorado River has evolved through time. Focus on how changing base level and stream incision created landforms, such as incised meanders and rincons, and arrange these events accordingly. Rank from oldest to youngest.

Explanation:

1. A stream moves parallel across its floodplain forming meanders, it ends at a lake which is also its base level.

2. Through crustal uplift, the base level of the stream becomes lowered and then the river starts to incise downwards.

3. This leads to the formation of incised meanders.

4. The cutoff of an incised meander leads to the formation of a rincon, this rincon shortens the river.

c, this answer is productivity.