1. Special edition for Class 3ª Castellarano

2. The Big Bang is a great explosion The Big Bang is the origin of clouds of gas.

3. In the center of a gas cloud the gravity force creates the SUN Around the Sun, masses of energy originate the PLANETS

4. 6 billion years ago… One planet is solid… There are clouds of gas and vapour. The Earth and its Atmosphere.

5. The centre of the Earth is very hot. Volcanoes erupt and create rocks and mountains.

6. Hot Volcanoes originate vapour. The vapour becomes water.

7. The Big Bang is…. A GREAT EXPLOSION. The Big Bang is the origin of… CLOUDS AND GAS. The Sun is created by the gravity… FORCE. Around the Sun masses of energy originate the… PLANETS 6 billion years ago the Earth is… SOLID The centre of the Earth is … HOT The vapour of the volcanoes becomes… WATER.