Lecture 4

Question 1

What percentage of the worlds water is fresh?

Answer 1

•2.6
1.984% ice caps and glaciers
• 0.592% Ground water

Question 2

How is water cycled on the earth?

Answer 2

• The water cycle is powered by the sun
• Water is the main sculpter of the world and it is the main transport of nutrients
• Hydrological cycle is the natural renewal of water quality

Question 3

The basic water cycle is the…

Answer 3

sun evaporating water, then it turns into cloud form and finally rains/snows to the ground – repeat cycle

Question 4

Surface runoff-

Answer 4

Water that does not go into the ground but either runs into a stream/ocean/lake or returns to the atmosphere

Question 5

Reliable run off-

Answer 5

Unfortunately 2/3 of the run off water is just garbage/shit undrinkable garbage water – only 1/3 of this run off is available for human use and this 1/3 is called the reliable run off

Question 6

Watershed or drainage Basin

Answer 6

• a region from which water drains into a stream, lake wetland etc

Question 7

Ground Water moves…

Answer 7

from high to low altitude and ends up in a stream or lake

Question 8

Aquifers pours water …

Answer 8

saturated layers of sand or gravel, a confined aquifier is bounded above and below by a impenetrable bed of rocks

Question 9

Most fresh water exists in the form…

Answer 9

of ice, snow, groundwater and soil moisture, with only 0.3% in liquid form on the surface.

Question 10

Only _______ is generally a valuable source.

Answer 10

River water

Question 11

An _______ is a pump-less water source that uses pipes to allow underground water that is under pressure to rise to the surface.

Answer 11

artesian well