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# delta

«delta» in Mova's school dictionary: **A flat, often triangle-shaped area of land where a river…** — its meaning for a pupil, its sense in the lessons and examples, with 4 sentences of Mova's corpora that use it.

### part of speech

noun (a delta, deltas)

### meaning for a pupil

1) A flat, often triangle-shaped area of land where a river splits into many smaller streams before it flows into the sea, made from mud and sand the river carries. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/delta/#m1)

2) The fourth letter of the Greek alphabet, Δ or δ. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/delta/#m2)

3) In maths and science, Δ can stand for a change in an amount. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/delta/#m3)

### sense in the lessons

In geography, deltas form at the mouths of rivers like the Nile and the Mississippi; the soil is rich for farming but floods easily. In maths and science, Δ means «change in». Phrases: «river delta», «the Nile Delta».

### examples

- The Nile Delta is shaped like a triangle. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/delta/#x1)
- The river drops its mud and sand to build a delta. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/delta/#x2)
- Many birds live in the wetlands of the delta. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/delta/#x3)
- Farmers grow rice on the delta because the soil is rich. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/delta/#x4)
- The Greek letter delta looks like a triangle: Δ. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/delta/#x5)
- Floods are common on a low, flat delta. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/delta/#x6)

### note

Countable: deltas. Named after the Greek letter Δ because many deltas are triangle-shaped. Not every river has a delta; strong waves or tides can wash the mud away.

### In the corpora

- [Mud carried by the great river piles up at its mouth, so this delta builds new land into the sea year after year.](https://md.mova.elamur.ai/free/en/corpora/school/biology/374-ukraine-s-waters-danube-delta-pelicans-black-sea-dolphins-sturgeon-and-gobies/1/)
- [The delta is home to hundreds of kinds of birds, fish and frogs.](https://md.mova.elamur.ai/free/en/corpora/school/biology/374-ukraine-s-waters-danube-delta-pelicans-black-sea-dolphins-sturgeon-and-gobies/7/)
- [A delta forms where a river drops its sediment at the mouth faster than the sea can carry it away.](https://md.mova.elamur.ai/free/en/corpora/school/geography/53-rivers-shaping-the-land/14/)
- [A delta is flat land built from the mud and sand a river drops where it slows down at its mouth.](https://md.mova.elamur.ai/free/en/corpora/school/world/43-landforms/13/)

### Trees and pragmatics

[Every meaning and example of «delta» parsed by Mova](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/delta/), each sentence with its dependency tree and frames.