Delta

High school (ages 12+)
Geography

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/delta

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the geomorphic controls?Influenced by sediment supply, basin energy (waves, tides, currents), and tectonic setting
2. What is the ecological role?Highly productive ecosystems, critical for biodiversity, fisheries, and migratory species
3. What is a river delta?A river delta is a fan-shaped landform that forms when a river slows down and drops its sediment into a sea, lake, or another river. The sediment builds up new land, creating a unique shape.
4. How do river deltas get their shape?When a river enters a standing body of water, its speed slows and it drops sand, silt, and clay. This sediment piles up, pushing the land outward and forming the delta.

Fluvial processes: Geological processes associated with rivers, including erosion, transport, and deposition of sediment.
Progradation: The seaward or lakeward extension of a deltaic landform through sediment deposition.
Subsidence: The gradual sinking or settling of the Earth's surface, often due to geological factors or groundwater extraction.
Distributary channels: Branching channels that carry river water and sediment away from the main channel across the delta.