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THE WATER CYCLE
Water is renewing in cycle.
First, the sun warmth makes the river and lake water evaporates (steam). The trees are also creating steam, because they breathe.
Then, the steam gets into clouds.
These clouds reject the water into rain or snow that goes into rivers and lakes, and then to seas and oceans.
THE DIFFERENT TYPES OF STREAMS
The streams are not on their own, they are organized in a hydrographic network which name is "catchment area". Each stream has a different lenght and a diffrent rate of draft.
Main river : flows into the sea by a stream mouth. (example : the river Charente goes into the Atlantic ocean by the Rochefort estuary)
River : flows into another stream : it is an affluent of the stream in which it flows (example : river Richelieu goes into the main river Saint-Laurent)
Catchment Area : basin that supplies a stream, and space it covers.
THE GEOLOGICAL ERAS
Period of time |
Era |
Features |
From -600 millions years To -250 millions years
|
PALEOZOÏC (Primary era) |
-A unique continent : Pangea |
From -250 millions years To -65 millions years
|
MESOZOÏC (Secondary era) |
-Continents move in their
current position |
From -65 millions years To -1,8 millions years |
CENOZOÏC (Tertiary era) |
-Alpine folds |
From -1,8 millions years To nowadays
|
QUATERNARY ERA |
-Ice Age -Human |