UNIT 3. THE EARTH: HYDROSPHERE

HYDROSPHERE (LIQUID PART OF THE EARTH)

THE THREE STATES OF WATER ARE:

SOLID - ICE AND SNOW (ICECAPS)

LIQUID - OCEANS, SEAS, RIVERS, LAKES, RAINFALL...

GAS - WATER VAPOUR (IN THE ATMOSPHERE)

SALT WATER: OCEANS AND SEAS.

THERE ARE FIVE OCEANS ON THE EARTH:

 PACIFIC OCEAN

 ATLANTIC OCEAN

 INDIAN OCEAN

 ANTARCTIC OCEAN

 ARCTIC OCEAN

SEAS ARE SMALLER THAN OCEANS: FOR EXAMPLE THE MEDITERRANEAN SEA

OCEANS AND SEAS HAVE SALT WATER (WATER HAS GOT SALT)

RIVERS, LAKES, AQUIFERS, RESERVOIRS, GROUNDWATER, RAINWATER ... ARE FRESHWATER (WATER HASN'T GOT SALT)

THE WATER IN RIVERS GOES TO OTHER RIVERS, TO LAKES AND TO THE SEA.

RAINWATER FILTERS DOWN THROUGH THE SOIL TO FORM GROUNDWATER

AQUIFERS ARE NATURAL STORES OF GROUND WATER UNDER THE GORUND

PARTS OF A RIVER

UPPER COURSE

 SOURCE OF THE RIVER

THE RIVER IS NARROW AND IT FLOWS QUICKLY

MIDDLE COURSE

THE RIVER IS WIDER AND FLOWS MORE SLOWLY

 MEANDERS

LOWER COURSE

THE LAND IS FLAT AND THE RIVER IS WIDE. THE RIVER FLOWS SLOWLY.

THE WATER CYCLE

EVAPORATION: THE SUN HEATS LIQUID WATER. WATER BECOMES VAPOUR AND RISES INTO THE AIR.

CONSENSATION: WATER VAPOUR COOLS AND CHANGES INTO WATER DROPS. THE DROPS FORM THE CLOUDS.

PRECIPITATION: WATER IN THE CLOUDS BECOMES RAIN AND FALLS ON THE LAND, OCEANS AND SEAS. 

IF IT IS COLD IT BECOMES SNOW

COLLECTION: RAINWATER FORMS RIVERS, LAKES AND GROUNDWATER.  WATER GOES BACK INTO THE 

SEA.

THE WATER CYCLE STARTS AGAIN!!

WASTE WATER AND PROCESSES TO PURIFY IT

DEPURADORA

POTABILIZADORA

http://medioambiente.aytosalamanca.es/es/aguas/descripcionservicio/