Q 01/05

How many countries share the Amazon basin?

A) Three

B) Nine

C) Five

D) Twelve

Answer · why

B) Nine

Brazil holds by far the largest share, followed by Peru and Colombia.

Q 02/05

Roughly what share of the Amazon rainforest lies inside Brazil?

A) About 30%

B) About 90%

C) About 45%

D) About 60%

Answer · why

D) About 60%

Peru has about 13% and Colombia about 10%; six other countries share the rest.

Q 03/05

Roughly how many individual trees are estimated to grow in the Amazon rainforest?

A) 39 billion

B) 3.9 billion

C) 390 billion

D) 3.9 trillion

Answer · why

C) 390 billion

They belong to about 16,000 different species.

Q 04/05

What share of all the world's known species is said to live in the Amazon rainforest?

A) One in two

B) One in a hundred

C) One in three

D) One in ten

Answer · why

D) One in ten

That includes about 2.5 million insect species and some 2,000 birds and mammals.

Q 05/05

How much of the world's remaining rainforest does the Amazon represent?

A) About a quarter

B) Over half

C) About a tenth

D) Nearly all of it

Answer · why

B) Over half

It is the largest and most biodiverse tract of tropical rainforest on Earth.