How deep is the Earth’s core?

In the geosphere of the planet Earth several layers are distinguished depending on the composition. The three main layers are the crust, mantle and core. The crust is the outermost layer made up of solid rock and a thickness that can vary from 11 km in mid-ocean ridges to 70 km in the highest mountain […]

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How are the elements classified in the periodic table?

The periodic table is a graphic representation of information on chemical elementslike the symbol or the atomic number, in columns and rows, that is, in a tabular layout. If read from left to right and top to bottom, the atomic number is increasing. The atomic mass is also increasing in this sense, with some exceptions. […]

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How are ions formed?

An ion is an atom or molecule that has a number of electrons different from the number of protons, which causes the atom or molecule to acquire a net non-neutral electrical charge. That is, they are electrically charged atoms or moleculeseither a positive charge or a negative charge. The term ion, from the Greek ἰών […]

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How are metamorphic rocks formed?

metamorphic rocks are rocks formed by physical or chemical alteration of other pre-existing rocks. The original rock is called protolith and it can be an igneous rock, a sedimentary rock, or even another previous metamorphic rock. They tend to be denser, more compact and harder than igneous and sedimentary rocks, and therefore more resistant to […]

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How are genetic diseases transmitted?

Genetic diseases are those that are due to a mutation or alteration of the genome. When this alteration is obtained through genetic inheritance, then we speak of inherited genetic diseases. On the contrary, if the genetic alteration occurs throughout life, then we speak of acquired genetic disease. Inherited genetic diseases can also be congenital if […]

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How are genes inherited?

The study of inheritance patterns, the way in which genes are transmitted from parents to offspring, is one of the main fields of study in genetics. As a precursor of this scientific discipline, Gregor Johann Mendel and the experiments he carried out during the second half of the 19th century are often cited. In diploid […]

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How are geysers produced?

A geyser is a type of hot spring which emits water and steam, sometimes accompanied by other gases, in the form of intermittent rashes. For their formation it is necessary that some hydrogeological characteristics concur that only occur in a few regions of our planet, which makes geysers a rare phenomenon. The number of active […]

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Does recycling paper save energy?

industrial paper manufacturing affects the environment in both directions of the process: in obtaining and processing raw materials and in the accumulation of waste materials. Recycling obviously reduces both impacts. The used paper that is recycled does not become garbage, but rather raw material. It is estimated that recycling one ton of newsprint saves the […]

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How are fingerprints formed?

Fingertip fingerprints are an individual characteristic well known for their use in forensic science for the identification of individuals. Its formation occurs during fetal developmentbeginning at about tenth week of gestation and completing in week 17, but it has not yet been possible to decipher exactly how these unique patterns are formed in each person. […]

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Does meat contain estrogen?

Meat contains estrogen naturally, but in addition, most livestock farms treat cattle with various synthetic hormonesincluding estrogens. Its influence on the estrogenic content of the diet and its effects on health is a controversial debate without clear data. What are estrogens? Estrogens are steroid hormones found naturally in mammalian animals, including humans. These estrogens produced […]

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Does eating eggs raise cholesterol?

The mean cholesterol content in the chicken egg it is 424 mg per 100 g, about 200 mg in an average sized egg. It is a really high content that supposes more than 60% of the recommended maximum daily intake of cholesterol. However the effect on blood cholesterol is minimalboth LDL cholesterol (bad cholesterol) and […]

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Do sharks have bones?

Sharks, escualos or selachimorfos (from the Greek σελαχος selachosshark and μορφή morpheform), are marine animals belonging to the superorder of the chondrichthyans. chondrichthyans are all cartilaginous fish, that is, their skeleton is made up of cartilage, a type of connective tissue. In other words, the sharks they have no bones. To give you an idea […]

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