Intensity results from two factors: the amplitude of the sound waves and how far they have traveled from the source of the sound. Amplitude is a measure of the size of sound waves. It depends on the amount of energy that started the waves.

Sound waves are changes in pressure generated by vibrating molecules. The physical characteristics of sound waves influence the three psychological features of sound: loudness, pitch, and timbre. Loudness depends on the amplitude,or height, of sound waves. The greater the amplitude, the louder the sound perceived.

3.1 Types of water source. In Study Session 1 you were introduced to the three main sources of water: groundwater, surface water and rainwater.

Here are the main five water sources:

• Municipal.
• Ground water (well)
• Surface water. Lake. River. Stream (creek) Shallow well.
• Rainwater.
• Seawater.

This article discussed 19 water-rich foods that will help you stay hydrated.

1. Watermelon. Share on Pinterest.
2. Strawberries. Water content: 91%
3. Cantaloupe. Water content: 90%
4. Peaches. Water content: 89%
5. Oranges. Water content: 88%
6. Skim Milk. Water content: 91%
7. Cucumber. Water content: 95%
8. Lettuce. Water content: 96%

Water molecules exist in two forms — different, but with almost identical physical parameters. Researchers refer to these two forms as ortho-water and para-water.

The original source of almost all fresh water is precipitation from the atmosphere, in the form of mist, rain and snow. Fresh water falling as mist, rain or snow contains materials dissolved from the atmosphere and material from the sea and land over which the rain bearing clouds have traveled.

Over 68 percent of the fresh water on Earth is found in icecaps and glaciers, and just over 30 percent is found in ground water. Only about 0.3 percent of our fresh water is found in the surface water of lakes, rivers, and swamps.

Rain and snow that falls on the land either seeps into low places – feeding aquifers and groundwater tables –or flows down hill, forming headwaters. Fresh water is found in glaciers, lakes, reservoirs, ponds, rivers, streams, wetlands and even groundwater.

Your drinking water comes from natural sources that are either groundwater or surface water. Groundwater comes from rain and snow that seeps into the ground. The water gets stored in open spaces and pores or in layers of sand and gravel known as aquifers. We use water wells or springs to harvest this groundwater.

The water on our Earth today is the same water that’s been here for nearly 5 billion years.

Potable water can be made from sea water, through a process known as desalination . This is because removing the large amount of sodium chloride (35 grams in every kilogram of sea water) requires a lot of energy . Desalination can be done by distillation and by reserve osmosis .

Humans cannot drink saline water, but, saline water can be made into freshwater, for which there are many uses. The process is called “desalination”, and it is being used more and more around the world to provide people with needed freshwater.

Seawater contains salt. Human kidneys can only make urine that is less salty than salt water. Therefore, to get rid of all the excess salt taken in by drinking seawater, you have to urinate more water than you drank. Eventually, you die of dehydration even as you become thirstier.

It is possible, therefore, for us to drink untreated rainwater. This is because rainwater is pure, distilled water evaporated from the sun – nothing else. However, when rainwater falls from the sky, substances from the air and land melt into the rainwater. This water (groundwater) is relatively safe for drinking.

Can you boil salt water to make it drinkable? No, boiling saltwater alone is not enough to make that water drinkable. The process of removing salt from water is called desalination and is more than simply boiling salt water.

Bring it to a boil and cook it until the water evaporates and you’re left with salt. Lovely, damp, fine-grained sea salt. It’s really that simple.

Desalination, the process of removing salt from water, is expensive. One common desalination method, reverse osmosis, is expensive because it requires a great deal of electricity to push water through a filter. It’s also costly to treat the water to kill microbes and to replace the filters.

Rivers discharge mineral-rich water to the oceans. Satellite view of La Plata River discharge to the Atlantic Ocean. One way minerals and salts are deposited into the oceans is from outflow from rivers, which drain the landscape, thus causing the oceans to be salty.

It’s all whale sperm. Everybody Google it. Because that’s why the water is salty. In fact, the saltiness “comes from many millions of years of water flowing over rocks and minerals,” according to oceanographer Simon Boxall.

The ocean is blue because water absorbs colors in the red part of the light spectrum. Like a filter, this leaves behind colors in the blue part of the light spectrum for us to see. The ocean may also take on green, red, or other hues as light bounces off of floating sediments and particles in the water.

The ice in the Arctic and Antarctica is salt free. You may want to point out the 4 major oceans including the Atlantic, Pacific, Indian, and Arctic. Remember that the limits of the oceans are arbitrary, as there is only one global ocean. Students may ask what are the smaller salty water areas called.