It is noted that silver jewelry and utensils need permanent cleaning because their color tends to black after a while and this is due to the interaction of silver with sulfur, creating silver sulfate, which causes this black color.
The arm has been known as a measure of lengths for a long time, and the arm is equal to 58 cm.
Gold is the most voluntary and malleable mineral, as gold can be formed more easily than other metals, and one ounce of gold can be extended in the form of a thread of 69.2 km
The proverb always strikes at the sharpness of the eyesight of the falcon, and the gaze of the meteor’s falcon is three times the sharpness of the man’s eyesight, and the eyesight is strong.
Demography is a science that specializes in the conditions of human society in terms of births, deaths, marriage, divorce, immigration, division of the population, and their classification according to many categories.
The vital substance in human blood is hemoglobin, and this substance is responsible for converting oxygen from red blood cells to decisive cells, and its blood content must not be less than 7% so that a person does not have anemia.
Sensing or tentacle pods are one of the most important organs of sensation in insects, and the shape of these pods varies from thin filaments to thick or heavily branched forms, which are also considered to be one of the olfactory organs of insects.
In 1838, French chemist Friedrich Kohlmann discovered the method of preparing nitric acid, by oxidizing the sawdust in the presence of a catalyst, platinum.
Flies have an enormous ability to reproduce as the female begins laying eggs about two weeks after their birth, and lays about 150 eggs, and she lays throughout her life about four times.
The ostrich is the largest bird in the world at the present time, despite the inability to fly due to its heavy body size.
The mixture of cobalt, copper, and samarium is the strongest metal compound in terms of magnetic attraction force.
Tetanus is a tetanus disease, which is one of the most dangerous diseases in human life, and it is among the diseases that the World Health Organization has identified as a quarantine.
Calcium sulfate is the scientific name for chalk used for writing in classrooms.
Anthropology is the name given to races.
Platinum is considered one of the most valuable and precious metals in the world. It was first discovered in 1736 in South America.
The chinchilla is a beautiful, soft-haired animal, whose fur is one of the most expensive furs in the world. It is native to the Andes Mountains in South America, and its length is about 30 cm.
It is known that the number of human teeth is 32 years, while the number of children's teeth is 20 years.
Lithium is the lightest mineral ever discovered, and this mineral was discovered by Swedish scientist "Edfuidson" in 1817.
One of the minerals that were discovered
In 1982 the German scientist Monzterge discovered the latest minerals, the mineral he called "Unilenium".
Dinosaur is one of the large animals that lived on the surface of the earth and became extinct millions of years ago, and it is one of the ranks of cold blood reptiles, and it was whitening and feeding on plants only.
The spider lives in almost every home and everywhere and is very active as it builds a house to hunt prey..and it produces silk threads and works from them precise geometric shapes..and a person thinks that the spider does this process without a drawn plan but what is it Truth?
One of the two studies of the life of the spider cut a string of home tissue with a small needle protected by fire and waited a little bit watching what the spider does and at moments of time the spider felt that something had happened to the tissue and quickly to the place where the pieces were made and he quickly began repairing the section until he returned Tissue exactly as it was before cutting.
A female crocodile lays between 30 to 60 eggs at a time, which is the size of a large turkey egg. It digs for eggs a hole on the coast close to the water, then covers the eggs with dirt, clay, or weeds, and then the warming that reaches the eggs from the sun The result of the fermentation of the plant or the material that is covered by raising the fetus inside the eggs. When the fetus is ready to go out, the mother hears the sound inside the egg, then he hurries to lift the cover curse. The fetus uses a tooth known as the age of hatching. Alone with the duties of her life and the length of the crocodile when leaving the egg is ho Li 20 cm.
Some people are accustomed to "cracking" a finger and enjoy the sound of the finger tensile strength and do not feel any harm during this.
One of the harmful consequences of this process is the loss of the sticky substance around the salami between the vertebrae of the fingers and the injury of the fingers to stiffness. Therefore, cracking the fingers is usually dangerous, so the human should not practice it until he does not suffer any damage because of this.
Minerals in the Earth's core consist of the deposition of minerals and minerals in water accumulated over time through the layers of different rocks. A person finds minerals from the ground clear or united with other bodies. To extract minerals, engineers and workers dig deep wells that are divided into tunnels, so workers drop to where they converge
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