Crystallization
Carbonation
Oxidation
Hydrolysis
What does Earth have that other planets don't, the basis of life? Water, of course.
Humans and other mammals drink specifically <em>freshwater</em> though, which is far more precious and less abundant than saltwater.
Answer:
we need tropical rain forests because they produce oxygen and clean the atmosphere to help us breathe. They also provide us with medicinal plants and may be the source to cure deadly diseases.
The answer to your question is knowledge. Scientific knowledge is the information gathered by the systematic study of nature.
