Every year over 27 millions tons of dust from Africa travel to and fall from the sky in the _____ basin.

Dust traveling from across the globe acts as an important _____ for plants in the rainforest.

Plants turn carbon dioxide into _____.

It’s not completely accurate to call the rainforest the “lungs of the planet” because...

Sediments washed out to the ocean from the Amazon rainforest provide nutrients for microorganisms called _____.

________ provide most of the oxygen that we breathe.

The atmosphere is ____ % oxygen.

The amount of oxygen in the atmosphere has _____ over the last billions of years.

The atmosphere is ____ .