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why do we call this process a cycle?
Because the process repeats over and over.
Where does the water go when it falls back to Earth?
Collection: some as surface water but most filters into the ground and collects as groundwater.
What is precipitation?
Water droplets in the clouds become to heavy and fall in the form of rain, snow, sleet, or hail.
What happens when the water in the air gets cooler?
condensation
What happens when the water in the ocean gets warmer?
evaporation
Is there always the same amount of water on the Earth?
Yes
What are the three courses of a river?
upper course, middle course, lower course
What kinds of human activity do you think pollute groundwater?
industry, agriculture, sewage
Why is groundwater sometimes less polluted than surface water?
It is protected from human activity by being underground.
How can we bring underground water to the surface?
By digging wells.
How does underground water come to the surface naturally?
Through natural springs.
How does water from rainfall get underground?
It filters through the cracks in the rocks and collects underground.
Is the water in the hydrosphere mostly salt water or fresh water?
salt water
What do we call the water on the surface of the geosphere?
The hydrosphere
Why are there no permanent rivers in deserts?
Because there is little precipitation.
Why is there more water in a river when it reaches the sea?
Because many tributaries have joined the main river beforehand.
Why do you think many cities are on rivers?
Because of easier access to water and transport.
Do rivers flow uphill or downhill?
Downhill
What is the difference between rivers and tributaries?
Rivers are continuous and begin in the mountains and end in seas or lakes. Tributaries are smaller rivers which join the main river before it reaches the sea.
What is the difference between surface water in oceans and surface water in lakes?
Surface water in oceans is salt water. Surface water in lakes is fresh water.
Why do all living organisms need the hydrosphere?
It keeps the Earth's temperature stable; provides water.
What does the hydrosphere provide for aquatic animals?
A habitat
Is most of the liquid water on the Earth drinking water?
No
Are clouds made of liquid water or water in a gaseous state?
liquid water
Are icebergs salt water or fresh water?
fresh water
What are the three states of water?
liquid, ice, and water vapour


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