The number of vibrations per second is known as the frequency, measured in Hertz (1 Hz = 1 vibration per second).

On Earth, the speed of sound at sea level — assuming an air temperature of 59 degrees Fahrenheit (15 degrees Celsius) — is 761.2 mph (1,225 km/h). Because gas molecules move more slowly at colder temperatures, that slows the speed of sound; sound moves faster through warmer air.

Sound is a wave created by vibrations. Sound waves travel faster in denser substances because neighboring particles will more easily bump into one another. Take water, for example. There are about 800 times more particles in a bottle of water than there are in the same bottle filled with air.

Play an association word game with children in which you say a word that describes a sound and children respond with a source for that sound, e.g., howl ➔ wolf, wind; scream ➔ audio track for a movie, siren, loon; screech ➔ owl, bluejay; creak ➔ floorboard, rocking chair, door opening; wail ➔ baby, rock band; buzz ➔ …

Sources of Sound Energy

• Acoustic Instruments. •••
• Electronic Instruments. Electrical vibrations are the starting point of sounds from electronic organs and synthesizers.
• Living Things. Animals and people make sounds with their vocal cords, their mouths and other body parts.
• Machines.
• Nature.

These are the different types of water sources around the globe and how they each play a role in what comes out of your home’s sink.

• Surface Water Resources.
• Groundwater Resources.
• Stormwater Resources.
• Wastewater Resources.
• Saltwater Resources.
• Ice Cap Water Resources.

4 Types Of Water

• Surface Water. Surface waters include streams, rivers, lakes, reservoirs, and wetlands.
• Ground Water. Groundwater, which makes up around 22% of the water we use, is the water beneath the earth’s surface filling cracks and other openings in beds of rock and sand.
• Wastewater.
• Stormwater.

aquifers, condenses, evaporation, groundwater, hydrological, percolates, precipitation, run-off, transpiration. Water on the Earth’s surface moves in an unceasing cycle through rivers, oceans, clouds and rain called the water or ……………… cycle.

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.

The sources of water are – Lakes, Rains, Ponds, Wells ,Glaciers ,dams and rivers.

There are a total of three natural sources of water. They are categorized as: rain water, underground water and surface water. Here is a look at each and what supplies these sources. Rain water includes other sources such as snow and additional types of precipitation.

Here are the main five water sources:

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

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.

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.

Although fresh water manifests in a variety of ways, there are two main types of fresh water: “Static” water, such as lakes and ponds, and flowing water, such as rivers and streams.

The ground penetrating radar (GPR) system is used for underground water detection. GPR is a promising technology to detect and identify aquifer water or nonmetallic mines. One of the most serious components for the performance of GPR is the antenna system.

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.

Groundwater supplies drinking water for 51% of the total U.S. population and 99% of the rural population. Groundwater helps grow our food. 64% of groundwater is used for irrigation to grow crops. Groundwater is a source of recharge for lakes, rivers, and wetlands.

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.

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

As far as we know, new water hasn’t formed either. That means there’s a very high chance the water in your glass is what thirsty dinosaurs were gulping about 65 million years ago. It’s possible that you could drink the same water as a stegosaurus or a T-Rex because of the way water circulates around our planet.

Since the U.S. Food and Drug Administration (FDA) does not require a shelf life for bottled water, the actual shelf life of water is indefinite! You will probably not find any sell by, use by or best by dates on your bottle of water.

“Old bottled water isn’t dangerous to drink but it can taste bad,” says Krogh, who thinks this is one of the reasons for expiration dates on water bottles. “If it has been stored poorly it’s likely to develop a bad taste and this could dent the reputation of the bottling plant.

Water is a natural substance and does not go bad, however the plastic water bottle will degrade over time and begin to leach chemicals into the water, which is why it is always important to choose BPA free bottled water.

You’ll need a safe container in which to store it. The general guideline is to use food-grade plastic bottles. You can also use glass bottles so long as they haven’t stored non-food items. Stainless steel is another option, but you won’t be able to treat your stored water with chlorine, as it corrodes steel.