Номер 4, страница 147 - гдз по английскому языку 9 класс учебник Комарова, Ларионова

Extra contents. 9. Geography - номер 4, страница 147.

Условие.

4 Read the text and put the paragraphs in the correct order.

How stalactites and stalagmites form

d Limestone is not very soluble in water, but when rainwater moves through calcium carbonate, it dissolves carbon dioxide and minerals from the limestone like this: H₂O+CO₂+CaCO₃=Ca(HCO₃)₂ Limestone is carried in water as calcium bicarbonate Ca(HCO₃)₂ and it moves through cracks in the rock.

e When the water travelling through the rock reaches a cave, some of the calcium bicarbonate transforms back into calcium carbonate. It comes out of solution and is deposited on the roof of the cave.

b Little by little a hollow stalactite grows downwards as water drips out of the cave ceiling depositing calcium carbonate.

a Very often the place on the cave floor where the drop of water lands is where a twin structure begins to grow up.

c Stalagmites form when calcium carbonate is deposited on the cave floor and the deposit grows upwards and sometimes even joins the stalactite above, forming a pillar.

Решение 1.

Решение 3.

Прочитайте текст и расположите абзацы в правильном порядке. Как образуются сталактиты и сталагмиты

Ответ:

The correct order of paragraphs explaining how stalactites and stalagmites form is: d, e, b, a, c.

Правильный порядок абзацев, объясняющих, как образуются сталактиты и сталагмиты, следующий: d, e, b, a, c.