Millions of years ago there were tiny animals and plants in the sea, When they died they fell to the bottom of the sea, At the bottom of the sea they were covered in mud, Over time layers of rock were laid down on top of the remains of the dead sea animals and plants, The rock put the dead animals and plants under high temperatures, high pressures and low oxygen conditions, These conditions over millions of years formed crude oil.

Tabela rankingowa

Motyw

Opcje

Zmień szablon

Przywrócić automatycznie zapisane ćwiczenie: ?