Planet earth

For how long has mankind existed?

• About 200,000 years

• About 20,000 years

• About 2 million years

• About 12,000 years

How long has life existed on earth?

• 1 million years

• 4 million years

• 10 million years

• 4 billion years

How many people of the earth's population (7,5 billion) live in cities?

• About 1 million

• About 10 million

• About 1 billion

• About 3 billion

How many people on earth live in desert lands?

• 500,000

• 1 million

• 2 million

• 5 million

How much water is required to produce 1 kg of beef?

• 3,000 l

• 7,000 l

• 13,000 l

• 30,000 l

How much water is required to produce 1 kg of rice?

• 2,000 l

• 4,000 l

• 6,000 l

• 8,000 l

What did the earth's atmosphere mainly consist of at its very beginning?

• carbon dioxide

• oxygen

• nitrogen

• argon

What is the percentage of trade worldwide done over the sea?

• 20 %

• 40 %

• 60 %

• 90 %

When did humans "invent" agriculture?

• 5,000 years ago

• 10,000 years ago

• 20,000 years ago

• 100,000 years ago

Which city built 3,000 towers in 20 years?

• Shanghai

• Mumbai

• New York

• Tokyo