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1

Tests on Illinois water gave ages of

50 to more than 100 years

2

Tests on Illinois water gave ages of 50 to more than 100 years. (Beyond 100 years, the tritium concentrations ................................)

could not be measured accurately

3

Tests on Illinois water gave ages of 50 to more than 100 years. (Beyond 100 years, the tritium concentrations could not be measured accurately.) These ages are generally in keeping with the ........................ when all the ........................... in each area are considered

anticipated values

hydrologic factors

4

water must travel through .......................... before becoming ground­water

various strata

5

water must travel through various strata before becoming ground­water. Below the surface it

moves first through the subsoil (the belt of soil water)

6

water must travel through various strata before becoming ground­water. Below the surface it moves first through the subsoil (the belt of soil water), .................................. , the .............................. and finally into .....................

the intermediate layer,

the capillary fringe

and finally into the groundwater bed.

7

A

8

B

9

C

10

D

11

E

12

F

13

G

14

H

15

I

16

J

17

water must travel through various strata before becoming ground­water. Below the surface it moves first through the subsoil (the belt of soil water), the intermediate layer, the capillary fringe and finally into the groundwater bed. 

These layers vary

in depth and are not too sharply defined

18

These layers vary in depth and are not too sharply defined. In fact, there is a ......................... from one to another

gradual transition

19

These layers vary in depth and are not too sharply defined. In fact, there is a gradual transition from one to another until

the ground water level or zone of saturation is reached

20

These layers vary in depth and are not too sharply defined. In fact, there is a gradual transition from one to another until the ground water level or zone of saturation is reached

Even after water moves into the ................................ much of it may still return to the ....................... 

topsoil and subsoil

atmosphere

21

Even after water moves into the topsoil and subsoil, much of it may still return to the atmosphere either through

evaporation or transpiration

22

Even after water moves into the topsoil and subsoil, much of it may still return to the atmosphere either through evaporation or transpiration. Water is held in the subsoil by

molecular attraction

23

Water is held in the subsoil by molecular attraction. It is only after

sufficient water has accumulated here that it begins to seep downward under the pull of gravity

24

It is only after sufficient water has accumulated here that it begins to seep downward under the pull of gravity. The subsoil may extend down

50 feet

25

It is only after sufficient water has accumulated here that it begins to seep downward under the pull of gravity. The subsoil may extend down 50 feet. It supplies the water needed for

the growth of vegetation

26

It is only after sufficient water has accumulated here that it begins to seep downward under the pull of gravity. The subsoil may extend down 50 feet. It supplies the water needed for the growth of vegetation. Consequently, it is extremely important to

farmers

27

Water in the intermediate belt is generally considered in

"dead storage."

28

Water in the intermediate belt is generally considered in "dead storage." To all intents and purposes it is

suspended and does not flow into wells

29

Water in the intermediate belt is generally considered in "dead storage." To all intents and purposes it is suspended and does not flow into wells. This belt varies from a

hairsbreadth to several hundred feet.

30

Below lies the capillary fringe. The thickness of this capillary fringe depends on its

composition