Water Systems (DP IB Environmental Systems & Societies (ESS): SL): Exam Questions

Complete the following sentences using the three figures provided below:

Freshwater makes up approximately ___ of the Earth’s water storages. The remaining water is saline.

Of this freshwater, approximately ___ is stored in the ground as groundwater. Most of the remaining water is locked up in the planet's glaciers and polar ice caps.

Of the remaining accessible, liquid surface freshwater, approximately ___ is found in the planet's rivers.

Figures:

1%

3%

30%

Outline what is meant by the term surface run-off.

Explain how surface run-off is generally affected by agriculture.

Define aquifer.