Constructive forces, also known as depositional forces, operate at or near the Earth's surface and result in the formation and buildup of landforms. They transport and deposit materials, such as sediments, rocks, and volcanic debris, shaping and modifying the Earth's topography. Listed below are some of the primary landforms created by constructive forces:

1. Alluvial Fans:

- Constructive work of rivers results in the formation of alluvial fans.

- They are fan-shaped deposits of sediments formed where a river leaves a mountainous region and enters a flatter area.

2. Floodplains:

- These are flat areas adjacent to a river that are periodically inundated during flooding.

- They are formed by the deposition of sediment during overbank flooding when a river overflows its banks.

3. Deltas:

- Deltas are formed where a river meets a larger body of water, such as an ocean or a large lake.

- Sediments carried by the river are deposited at the river's mouth, building up triangular-shaped landforms known as deltas.

4. Moraines:

- Moraines are ridges or mounds of rocks, debris, and sediment deposited directly by glaciers.

- They form when glaciers advance, carrying and depositing material, or when they retreat, leaving behind the accumulated debris.

5. Sand Dunes:

- Sand dunes are mounds or ridges of windblown sand that accumulate in deserts, coastal areas, or other arid environments.

- They are formed as wind carries and deposits sand particles, creating various dune types based on wind patterns and sand availability.

6. Loess Deposits:

- Loess is a fine-grained, windblown sediment deposited over vast areas.

- It is transported by the wind from sources like deserts or glacial deposits and accumulates on open landscapes, forming thick deposits.

7. Lava Domes and Flows:

- Lava domes are rounded, bulbous protrusions of viscous lava that builds up around volcanic vents.

- Lava flows are broad sheets of molten lava that emanate from volcanic eruptions and solidify as they cool.

8. Cinder Cones:

- These are small, steep-sided hills formed from the accumulation of cinder and volcanic fragments around a volcanic vent.

- They result from explosive eruptions that eject cinders and volcanic bombs.

9. Coral Reefs:

- Coral reefs are constructive organic structures built by colonies of coral polyps in warm, shallow marine environments.

- They are composed of calcium carbonate deposited by living corals, forming diverse reef structures, including barrier reefs, atolls, and fringing reefs.

10. Beach Ridges:

- Beach ridges are series of parallel sand ridges formed by the uprush and backwash of waves along shorelines.

- They are deposited as waves transport and accumulate sand in shallow water near the shore.