a stream or small river that drains into a larger river
Tributary
plants that cover a particular area
vegetation
to set someone or something free
liberate
an effort by many people to change the government
rebellion
farming that provides enough food to live on
subsistence farming
the process by which plants and trees release water vapor into the air
transpiration
having flat areas on the side of a hill or mountain, used to grow crops
terraced
an official agreement made between two or more countries or groups
treaty
a dry region on the downward side of a mountain range
rain shadow
to change something so it functions better
adapt
someone who is related to peoples who lived in the past
descendants
a geographic feature that stretches nearly the width of South America
Amazon Basin
the continuous movement of air or water in the same direction
current
to carefully uncover something by digging away and removing the earth that covers it.
excavate
an object made by people in the past
artifact
This can cause flooding in South America that can damage roads, crops and homes
El Nino
a gas that absorbs heat energy and warms Earth's atmosphere
greenhouse gas
the complete control of the entire supply of goods
monopoly
a member of a group of people who move from place to place
nomad
The study of the Earth and everything on it
Geography