8.1 Meanings :
1. Equatorial– near the equator .
2. Tributaries – stream flowing into a larger river .
3. Region – an area .
4. Staple – important element of something .
5. Mouth– an opening .
6. Bromeliads – a plant of tropical and subtropical America .
7. Manioc – another term for cassava .
8. Malocas – an ancestral long house used by the natives of the Amazon .
9. Population density – number of people per unit of area .
10. Piranha – a deep-bodied South American freshwater fish .