In which country has 75% of the wet tropical rainforest been destroyed?

• in Chile
• in the Congo
• in Australia

The destruction of the tropical rainforest is a real tragedy for this country in the process of desertification.

If one could unfold the chromosomes of all the cells in the human body, what would be the length of the filament obtained?

• several metres
• several kilometres
• several million kilometres

The filament obtained would be long enough to extend from the Earth to the Moon 8,000 times.

Which type of cloud is found up to an altitude of 20 km ?

• stratus
• cumulonimbus
• stradivarius

Cumulonimbus are very large clouds which develop vertically and often announce heavy rain and storms.

Where were 12 Chinese school children found after being carried off  by a tornado in 1986?

• on some sand dunes
• in the ocean
• on the top of a tree

After being sucked up and carried away by the tornado, the speed of which can reach 400 km/h, the 12 students were found safe and sound on some sand dunes 20 km away.

On average, how much time does a European spend in traffic jams over the course of his life?

• 6 months
• 2 years
• 4 years

The automobile is already a real plague in many European capitals where 1/4 of all trips are less than 1 km. Unfortunately the trend is not reversing.

Which problem were large European cities confronted with at the beginning of the 20th century?

• intensive pig-farming
• the multiplication of pigeons
• an increase in horse droppings

At the time, horses were used in town for the transport of people and goods. Transport pollution is not a new problem!