--- title: Clouds, rain, snow and hail — a lesson of Mova's school · trees and pragmatics description: «Clouds, rain, snow and hail», a lesson of the world course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: A cloud is made of billions of tiny water droplets or ice crystals, so small that the gentlest rising air keeps them floating; a cloud is not wa --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/world/67-clouds-rain-snow-hail/) [home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [school](https://md.mova.elamur.ai/free/en/corpora/school/) / [World](https://md.mova.elamur.ai/free/en/corpora/school/world/) / Clouds, rain, snow and hail # Clouds, rain, snow and hail Lesson 67 of the world course of Mova's primary school: 19 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0). How Mova does on its tests: [the lesson at school](https://md.mova.elamur.ai/free/en/school-run/world/67-clouds-rain-snow-hail/). - [0](https://md.mova.elamur.ai/free/en/corpora/school/world/67-clouds-rain-snow-hail/0/) — A cloud is made of billions of tiny water droplets or ice crystals, so small that the gentlest rising air keeps them floating; a cloud is not water vapour, which is invisible. - [1](https://md.mova.elamur.ai/free/en/corpora/school/world/67-clouds-rain-snow-hail/1/) — It takes about a million cloud droplets joined together to make one raindrop heavy enough to fall. - [2](https://md.mova.elamur.ai/free/en/corpora/school/world/67-clouds-rain-snow-hail/2/) — Clouds have names by their shape and height: cumulus are white puffy heaps of fair weather; stratus are flat grey sheets that may bring drizzle; cirrus are thin wisps of ice high up; a cumulonimbus is a towering storm cloud that brings heavy rain, thunder and sometimes hail. - [4](https://md.mova.elamur.ai/free/en/corpora/school/world/67-clouds-rain-snow-hail/4/) — In cold clouds, raindrops usually start as ice: crystals grow on specks of dust, collect into snowflakes, and melt into rain on the way down if the air near the ground is warm. - [6](https://md.mova.elamur.ai/free/en/corpora/school/world/67-clouds-rain-snow-hail/6/) — Hail is made only in tall thunderstorm clouds: strong winds inside carry a frozen drop up and down again and again, and each trip adds a new layer of ice, like the layers of an onion, until the hailstone is too heavy and falls, even in summer. - [7](https://md.mova.elamur.ai/free/en/corpora/school/world/67-clouds-rain-snow-hail/7/) — On clear calm nights the ground cools, and water vapour from the air condenses on cold grass as dew; when the grass is below freezing, the vapour turns straight into ice crystals called frost. - [8](https://md.mova.elamur.ai/free/en/corpora/school/world/67-clouds-rain-snow-hail/8/) — Clouds are made of tiny water droplets or ice crystals, not of water vapour. - [9](https://md.mova.elamur.ai/free/en/corpora/school/world/67-clouds-rain-snow-hail/9/) — About a million cloud droplets make one raindrop. - [10](https://md.mova.elamur.ai/free/en/corpora/school/world/67-clouds-rain-snow-hail/10/) — Cumulus clouds are white and puffy and usually mean fair weather. - [11](https://md.mova.elamur.ai/free/en/corpora/school/world/67-clouds-rain-snow-hail/11/) — Stratus clouds are low flat grey sheets. - [12](https://md.mova.elamur.ai/free/en/corpora/school/world/67-clouds-rain-snow-hail/12/) — Cirrus clouds are thin wispy clouds of ice high in the sky. - [13](https://md.mova.elamur.ai/free/en/corpora/school/world/67-clouds-rain-snow-hail/13/) — Cumulonimbus clouds are tall storm clouds that bring heavy rain, thunder and hail. - [14](https://md.mova.elamur.ai/free/en/corpora/school/world/67-clouds-rain-snow-hail/14/) — Fog is a cloud that forms at ground level. - [15](https://md.mova.elamur.ai/free/en/corpora/school/world/67-clouds-rain-snow-hail/15/) — Snowflakes have six sides or six arms. - [16](https://md.mova.elamur.ai/free/en/corpora/school/world/67-clouds-rain-snow-hail/16/) — Hail forms in thunderstorm clouds as ice layers are added while strong winds carry it up and down. - [17](https://md.mova.elamur.ai/free/en/corpora/school/world/67-clouds-rain-snow-hail/17/) — Thunderstorm clouds reach so high that their tops are far below freezing, even in summer. - [18](https://md.mova.elamur.ai/free/en/corpora/school/world/67-clouds-rain-snow-hail/18/) — Dew is water vapour that condenses on cold surfaces; frost forms when the surface is below freezing. - [19](https://md.mova.elamur.ai/free/en/corpora/school/world/67-clouds-rain-snow-hail/19/) — Clouds act like a blanket at night, so the ground loses the most heat on clear nights. - [20](https://md.mova.elamur.ai/free/en/corpora/school/world/67-clouds-rain-snow-hail/20/) — Rainfall is measured with a rain gauge in millimetres. - ← previous: [Deserts, rainforests and grasslands](https://md.mova.elamur.ai/free/en/corpora/school/world/66-deserts-rainforests-grasslands/) - next →: [Storms: thunder, lightning, hurricanes and tornadoes](https://md.mova.elamur.ai/free/en/corpora/school/world/68-storms-and-wild-winds/) - ↑ back to [World](https://md.mova.elamur.ai/free/en/corpora/school/world/)