20. Раскрой скобки. Укажи время. Deserts
(to be) the driest places in the
world.
2. Different seaweeds
(to live) in
the oceans many years ago.
3. Salty sen
(to cover) more than half of
the world.
4. The weather is wet now. Helen
(to wear)
her new raincoat.
5. These plants
(not to grow)
high up in the mountains.
6. The weather
(not to be) dry in the
jungles.
1. Big animals
(not to live) in the grass-
lands.
8. Little Tom
(not to swim)
In this deep lake last summer.
9. Last month we
(to be) at the zoo and
(to see) eagles.
10. What are you doing? - I
(to watch)
cartoons
11. Cats
(not to eat) tomatoes
but my cat
(to do)
12. My parents
(to buy) a puppy now​

Snow or ice that slides down a steep slope at great speed. Avalanches occur when the force of snow on the surface is formed under the influence of heavy snowfall, rapid melting of snow, rainfall, recrystallization of a loose layer of snow with a deepening. According to the nature of the landslide, it is divided into landslides, troughs and landslides. During an avalanche of dry snow, a wave of air appears in front of it, which has time to spread. Avalanches follow their former trampled path, the lake. 2 million m3, and the impact force is up to 60 - 100 t / m3. In landslide-prone mountains (Ili, Semirechye Alatau, etc.) avalanche protection systems (snow shields, artillery shelling of dangerous slopes, etc.) are established, deforestation is prohibited. Trees will be laid on landslide-prone slopes. Avalanches are caused by the collapse of vertical hanging glaciers and their downward movement.