The water of the oceans is salty because the rivers dissolve salt minerals from the mountains and bring them into the sea.
When the water evaporates at the surface the salt remains.
Over millions of years, the amount of salt reached such a scale that the sea water has become undrinkable.

What is salinity?

The salt content in seawater, expressed in grams, is called salinity. The average ocean salinity is 35ppt, which means that in every kilogram (1000 grams) of seawater, 35 grams are salt.
The ocean water in estuaries is a mix of fresh and ocean water, so the salinity there is less than the open ocean. Also, bottom water almost always contains more salt than surface waters.

Why cant humans drink salt water?

The ocean animals have same salinity inside their bodies as the water outside, because the water likes a balance. If for example salt water animal is placed in fresh water, the fresh water will enter into the animal through its skin. Also, if fresh water animal found is placed into salty water, the water inside of it will rush out.  This process in which water flows from an area of high concentration (lots of water, little salt) to an area of low concentration (little water, lots of salt) is called osmosis.
This is the main reason why humans can’t drink salt water. 
When extra salts enter the body, it will try to expel them as quickly as possible. The kidneys will try to flush the salts out in the urine, and in the process, it will pump out large amount of water - more than taken.
This leads to dehydration, and the cells and organs will not be able to function properly.

The Dead Sea is the saltiest sea in the world, six times saltier from the water in the oceans!

The Dead Sea water has so many minerals, that the head and shoulders of the swimmers are always out.  

The Dead Sea is actually a large, narrow salt lake, which lies between the River Jordan and the State of Israel. It, has the lowest elevation in the world, about 400 meters below the surface of the Mediterranean Sea.

Schools over in my nabe and summer stretches ahead, filled with promise. Vacation, pool parties, camp, catching fireflies at night, the plans are endless. For beginning readers, though, its important not to put reading on the back burner. Skills hard won over the school year can erode as the months go by.

Summer reading should never be a chore. Take kids to the library and let them stock up on books they enjoy. Used book stores are another place to get good deals on inexpensive paperbacks, as are yard sales that sprout as quickly as dandelions.

Here are some books for beginning readers that capture the essence of summer. Let the good times begin!



EASY READERS

Frog and Friends: The Best Summer Ever
by Eve Bunting, illustrations by Josee Masse
Sleeping Bear Press, 2012
40 pages

Frog and his friends are back with a trio of stories about summer. Readers who have read all the books in Lobels Frog and Toad series will feel right at home.

Cork and Fuzz: The Swimming Lesson
by Dori Chaconas, illustrations by Lisa Mccue
Viking, 2011
32 pages

Cork, a muskrat, tries to teach Fuzz, a possum, how to swim with humorous results.

Sam and the Firefly
by P.D. Eastman
Random House, 1958
72 pages

An oldie but still a goodie. Sam, a hoot owl, and Gus, a firefly, get in and out of trouble in this classic easy reader.

CHAPTER BOOKS


Julians Glorious Summer
by Ann Cameron
Perfection Learning, 1987

When Julians friend, Gloria, gets a new bike, Julian fibs rather than tell her hes afraid of bikes. That fib snowballs and his summer turns out very different than what he expected.

POETRY

A Stick Is an Excellent Thing: Poems Celebrating Outdoor Play
by Marilyn Singer, illustrations by LeUyen Pham
Clarion Books, 2012
40 pages

Joyful poems and stunning artwork capture kids playing outdoors in summer.

Poem Runs: Baseball Poems
by Douglas Florian
Harcourt, 2012
32 pages

Poems featuring Americas favorite sport for kids six and up.

Carbohydrates are one of the substances that are required in the human metabolic system. Carbohydrates include the most abundant organic compound on earth. These compounds have a variety of functions in the human metabolic system performance, mainly as a reserve food as "fuel", and builder materials.

In addition, carbohydrates also have a stake in the process of photosynthesis. In the process of photosynthesis, plants convert carbon dioxide into carbohydrates. Carbohydrates are the main energy-forming substances humans in performing all daily activities. Sources of carbs include whole grains and their processed products and tubers.

Classification of Carbohydrates

Monosaccharide
Monosaccharides are the simplest carbohydrates because the molecule consists only of a few atoms C and can not be described by way of hydrolysis into other carbohydrates. Monosaccharides divided into two, namely aldose and ketosa. Examples of aldose called glucose and galactose. While ketosa example is fructose.

Disaccharide
Disaccharide is a carbohydrate that is formed from two monosaccharide molecules bonded through-OH groups by releasing water molecules. Examples of disaccharides are sucrose, lactose, and maltose.

Polysaccharides
Polysaccharides are carbohydrates composed of many saccharides as a monomer. The general formula is C6 polysaccharides (H10O5) n. Examples of polysaccharides are cellulose, glycogen, and starch.

Biological Role of Carbohydrates

Role of the Biosphere
The process of photosynthesis to provide food for almost all life on earth, either directly or indirectly. Organisms autotraof (which can turn into organic inorganic materials), such as green plants, bacteria and algae utilize direct result of photosynthesis. While the majority of heterotrophic organisms (which require organic compounds), including humans really depends on the organism autrotrof to get food.

Role As Fuel and Nutrition
Carbohydrates provide the necessary basic needs of living bodies. For example, glucose (from carbohydrate compounds) which is the main nutrient cells. The bodys cells to absorb glucose and retrieve the stored energy to run the bodys cells. For humans, carbohydrates are a source of nutrients. In one gram of carbohydrates, there is an energy value equal to 4 calories.

Role In Energy Reserves
Several types of polysaccharides serve as energy reserves. Later, the stored energy will be hydrolysis to provide sugar to the cells when needed. Starch is a polysaccharide deposits in plants. Plants accumulate starch as granules or granules in the plastid organelles, including kroloplas. By synthesizing starch, herbs can pile up excess glucose. Glucose is the main fuel cell, so that the starch is stored energy.

The Role As a matter Builders
Organisms building materials stronger than structural polysaccharides. For example, cellulose is the main component of plant cell walls. Cellulose is like fibers, clay, insoluble in water, and is found mainly in the stalk, stem, branches, and all the woody parts of the plant tissue. Wood is mainly composed of cellulose and other polysaccharides. For example, hemicellulose, and pectin. Meanwhile, the cotton is made almost entirely of cellulose.

The Role As a Regulatory Fat Metabolism
Carbohydrates prevent the oxidation of fats that are not perfect. If enough energy is not available, will result in increased catabolism of fat. As a result, the accumulation of ketone bodies in the blood and occurs acidity.

Role For Protein saver
Energy is the bodys primary needs. Therefore, if the carbohydrates that come from insufficient food, protein is converted to produce an amount of energy. In fact, the protein has a primary function as builder substances and tissue repair. In order to be used according to its function, carbohydrate must be met in the daily menu.

Carbohydrate Sources

Carbohydrate is the main nutrient that must exist in a serving of the main meal, for the benefit of carbohydrates as a source of human energy. Eating foods with no carbohydrates cause us to be easily limp, no spirit and activity would quickly attacked panyakit.


There are a number of foods that contain high carbohydrates commonly consumed by humans. Heres a row of staple foods that contain carbohydrates, and used as a staple food in many countries:

• Rice

Rice is one of the most food sources consumed by humans. Especially Austronesian people, food consumption patterns, they are highly dependent on rice or rice. Rice is classified as plant seeds that live in watery land. Grain crops is a type of age only 110 to 115 days from planting seeds. Type of carbohydrate content of rice is amylose and amylopectin. In addition contains a lot of carbohydrates, there are other nutrients that sugar, protein, calcium, minerals and vitamin B.

The part that can be consumed in addition to grain inner skin is also better known as bran. Collected when the rice bran penggilangan process. The trick is filtered and separated between the outer skin / damen, bran / rice barn and white rice. Bran is rich in vitamin B complex that are beneficial to human health.

In the world there are many types of rice farming that each have their own characteristics and nutritional value are different. For example, grain glutinous rice white color and when ditanak result becomes sticky. Glutinous rice more delicious when made into snacks, or even ground into flour. There was also a red rice Vitamin B complex the sometimes higher than other types of rice.

• Yam

Yam or cassava is a staple food of high carbohydrates derived from types of tubers. Cassava in Latin Manihot esculenta, Euphorbiaceae in the tribe. Cassava leaves can be consumed by humans as a vegetable or also used as fodder.

In Indonesia, there are some people who make cassava as a staple food, namely rural Wonogiri and Gunung Kidul. They cultivate cassava as the land in which they live, it is very difficult to grow rice. Rice can not grow well in soil with minimal water. Therefore, mountain residents prefer cassava as staple food source. Moreover, the excess of cassava can grow on barren soil water content slightly. Additionally yam or cassava durable long-term storage. Cassava is preserved called cassava.

 The content of nutrients in cassava is very diverse including: calories 121 cal, 34.00 grams carbohydrates, 33.00 grams of calcium, and also other phosphor, vitamin B 1, minerals, sugars, and so forth. Even today it is still consumed cassava but has undergone a process of modification of food. Cassava can be a wide variety of foods such as cassava cake, getuk, brownies and more.

• Potato

Potatoes are also included in the staple foods of plant tubers that contain high carbohydrates. According to historical sources, the potato Latin name Solanum tuberosum L. originated from South America. Is the main food Indian society. Potato is cultivated in Europe thanks to Christopher Columbus who brought home a sample of the food crops of the Americas. And eventually become one of the staples of Europeans and Americans.

Potato plants can flourish only in the upland farm, the weather was cold only. Soils used must be kept loose in order to maximize the growth of the tuber. Potatoes are seasonal crops, which is short. In the plant there are many bulbs that dihubangkan the root fibers. Potato tubers wrapped in yellow skin while the meat was thin and watery yellow.

Nutrient content in the potato is very diverse, which must contain carbohydrates, but the sugar content is very low. It also contains vitamins B1, B2, B3, fiber and calcium. Therefore, people with diabetes are encouraged to change the diet of rice is replaced with boiled potatoes, to control blood sugar levels. Potatoes are also very well taken daily as to diet, lose weight.

• Corn

Another food that is a source of carbohydrate is maize or Zea mays L. This plant is actually derived from the Latin American continent, tepatny from South and Central America. Maize is the staple food of the Aztecs and American Indians. Its history is the same as the potato spread to the world through the medium of sailors. Americans use corn as the primary protein source, while in Indonesia there are also people who make maize as a staple food, which is in Madura and communities on the island of Flores. The content of nutrients and carbohydrates in maize is similar to rice and wheat. So eating a plate of rice corn nutritional value equal to a serving of hot rice.

Such reviews about the benefits of carbohydrates and other foods that contain high energy. Hopefully useful.