1.4. World Water Balance

Try these first

1. 1.

   How much precipitation falls over land annually?

   Hint

   Think about where rain collects.

2. 2.

   What is one method for water loss from land?

   Hint

   How does water 'disappear' into the air?

3. 3.

   How much precipitation falls over oceans annually?

   • 110 km³/year
   • 390 km³/year
   • 425 km³/year

   Hint

   Think about where most rains fall.

4. 4.

   True or False: Evaporation from land is greater than from oceans.

   • True
   • False

   Hint

   Remember the figures!

5. 5.

   If global precipitation increases by 20% uniformly, how does it impact the water balance?

   Hint

   Consider changes in input versus output.

6. 6.

   Evaluate the impact of increased evaporation due to climate change on local water resources.

   Hint

   Think about what happens when water levels drop.